Petrichor Codex LogoPetrichor Codex

How this list is ordered

A completion checklist is only useful if it tells you where you are likely to get stuck, and the unlock percentages do exactly that. Sorting by them turns the list into a difficulty map: the achievements almost everyone has sit at one end, and the ones a fraction of a percent of players have earned sit at the other.

Every figure on this page comes from the platform's own statistics rather than from an estimate. Confirmed by official sources — the objective line under each name is the game's own wording, kept because a checklist without the objective is not a checklist.

The spread

Unlock rate bandAchievements
Rarest (under 1%)34
Rare (1–5%)45
Uncommon (5–20%)59
Common (20–50%)38
Held by most players (50%+)29
No rate published0

Band thresholds are ours, not the platform's. They exist so the list can be filtered; they are not a judgement about any individual achievement.

The five fewest players have

  1. 1Acolyte: MasteryAs Acolyte, beat the game or obliterate on Monsoon.0.1%
  2. 2Acolyte: Memento MoriAs Acolyte, defeat what lies beyond the door of Soulbound Threshold.0.1%
  3. 3Acolyte: BloodbathAs Acolyte, kill 15 enemies within one transformation into the Anima Harvester.0.1%
  4. 4Acolyte: Not Even CloseAs Acolyte, keep an Elder Lemurian airborne for 11 seconds.0.1%
  5. 5Acolyte: Hit ListAs Acolyte, land a killing blow with Sacrifice on 20 different types of monsters in a single run.0.1%

At the other end, Elite Slayer is held by 90.8% of players — effectively a tutorial step that almost everyone clears within their first run.

The checklist205 entries

Sort by rarity, filter to the band you are working through, and tick entries off as you go. Your ticks stay in this browser.

Showing 205 of 205 · 0 marked as done in this browser

  • Acolyte: Mastery

    As Acolyte, beat the game or obliterate on Monsoon.

    0.1%Rarest
  • Acolyte: Memento Mori

    As Acolyte, defeat what lies beyond the door of Soulbound Threshold.

    0.1%Rarest
  • Acolyte: Bloodbath

    As Acolyte, kill 15 enemies within one transformation into the Anima Harvester.

    0.1%Rarest
  • Acolyte: Not Even Close

    As Acolyte, keep an Elder Lemurian airborne for 11 seconds.

    0.1%Rarest
  • Acolyte: Hit List

    As Acolyte, land a killing blow with Sacrifice on 20 different types of monsters in a single run.

    0.1%Rarest
  • Enforcer: Mastery

    As Enforcer, beat the game or obliterate on Monsoon.

    0.1%Rarest
  • Enforcer: Dying to Meet You

    As Enforcer, complete Soulbound Threshold before the 4th Teleporter event.

    0.1%Rarest
  • Enforcer: Burning Lead

    As Enforcer, shoot a Magma Worm 24 times in 12 seconds.

    0.1%Rarest
  • Commando: Dying to Meet You

    As Commando, complete Soulbound Threshold before the 4th Teleporter event.

    0.1%Rarest
  • Huntress: Dying to Meet You

    As Huntress, complete Soulbound Threshold before the 4th Teleporter event.

    0.1%Rarest
  • Bandit: Memento Mori

    As Bandit, defeat what lies beyond the door of Soulbound Threshold.

    0.1%Rarest
  • MUL-T: Against All Odds

    As MUL-T, complete a run while holding 10 Hexes.

    0.1%Rarest
  • Engineer: Memento Mori

    As Engineer, defeat what lies beyond the door of Soulbound Threshold.

    0.1%Rarest
  • Artificer: Memento Mori

    As Artificer, defeat what lies beyond the door of Soulbound Threshold.

    0.1%Rarest
  • Mercenary: Against All Odds

    As Mercenary, complete a run while holding 10 Hexes.

    0.1%Rarest
  • REX: Memento Mori

    As REX, defeat what lies beyond the door of Soulbound Threshold.

    0.1%Rarest
  • Loader: Against All Odds

    As Loader, complete a run while holding 10 Hexes.

    0.1%Rarest
  • Acrid: Dying to Meet You

    As Acrid, complete Soulbound Threshold before the 4th Teleporter event.

    0.1%Rarest
  • Captain: Memento Mori

    As Captain, defeat what lies beyond the door of Soulbound Threshold.

    0.1%Rarest
  • Railgunner: Against All Odds

    As Railgunner, complete a run while holding 10 Hexes.

    0.1%Rarest
  • ?V??oid Fiend?: Against All Odds

    As ?V??oid Fiend?, complete a run while holding 10 Hexes.

    0.1%Rarest
  • Seeker: Dying to Meet You

    As Seeker, complete Soulbound Threshold before the 4th Teleporter event.

    0.1%Rarest
  • False Son: Against All Odds

    As False Son, complete a run while holding 10 Hexes.

    0.1%Rarest
  • CHEF: Dying to Meet You

    As CHEF, complete Soulbound Threshold before the 4th Teleporter event.

    0.1%Rarest
  • Artificer: One Giant Leap

    As Artificer, reach the final boss on the moon without activating a pillar.

    0.1%Rarest
  • Commando: Retribution

    As Commando, defeat the final boss after earning 8 karma.

    0.1%Rarest
  • Engineer: Mad Scientist

    As Engineer, repair an Equipment Drone with an Escape Pod's Fuel Array.

    0.1%Rarest
  • Huntress: Tomb Raider

    As Huntress, obtain an Artifact from the Bulwark's Ambry in 25 minutes or less.

    0.1%Rarest
  • REX: Invasive Growth

    As REX, beat the game with at least 5 different Lunar items.

    0.1%Rarest
  • Acrid: Miracle

    As Acrid, beat the game after sequencing your items at least once.

    0.1%Rarest
  • A Broken Ritual

    The source page publishes this entry without an objective line.

    0.2%Rarest
  • Enforcer: Indomitable

    As Enforcer, survive an entire Stone Titan's laser without blocking.

    0.2%Rarest
  • Enforcer: +PARRY

    As Enforcer, parry a Wandering Vagrant's supernova.

    0.3%Rarest
  • Enforcer: Safe and Sound

    As Enforcer, block the attacks of 12 enemies during a single teleporter event.

    0.6%Rarest
  • REX: Accept and Decompile

    The source page publishes this entry without an objective line.

    1.5%Rare
  • Captain: Accept and Decompile

    The source page publishes this entry without an objective line.

    1.7%Rare
  • Loader: Accept and Decompile

    The source page publishes this entry without an objective line.

    1.7%Rare
  • Artificer: Accept and Decompile

    The source page publishes this entry without an objective line.

    1.7%Rare
  • Bandit: Accept and Decompile

    The source page publishes this entry without an objective line.

    1.8%Rare
  • MUL-T: Purge

    The source page publishes this entry without an objective line.

    1.8%Rare
  • Operator: Not So Different

    As Operator defeat the teleporter boss on Conduit Canyon without touching the ground.

    1.8%Rare
  • Acrid: Purge

    The source page publishes this entry without an objective line.

    1.9%Rare
  • Mercenary: Purge

    The source page publishes this entry without an objective line.

    1.9%Rare
  • Engineer: Purge

    The source page publishes this entry without an objective line.

    2%Rare
  • Commando: Purge

    The source page publishes this entry without an objective line.

    2.1%Rare
  • Operator: That Just Happened

    As Operator keep an Elder Lemurian airborne for 10 seconds.

    2.1%Rare
  • False Son: Family Bonding

    As False Son, have Aurelionite kill the final boss while the final boss is inflicted with at least one Lunar Ruin.

    2.2%Rare
  • Huntress: Purge

    The source page publishes this entry without an objective line.

    2.2%Rare
  • Drifter: Mastery

    The source page publishes this entry without an objective line.

    2.2%Rare
  • Drifter: In The Bag

    As Drifter defeat a boss from the challenge of the Mountain using a Shrine of the Mountain.

    2.2%Rare
  • Trial of Prestige

    Complete the Trial of Prestige

    2.4%Rare
  • Drifter: Leave No Trace

    As Drifter claim the contents of the lost backpack in the vault of Solutional Haunt.

    2.5%Rare
  • Seeker: Scorched Earth

    Deal 500,000% damage with one use of Sojourn's explosion

    2.7%Rare
  • CHEF: It’s Getting Hot In Here!

    As CHEF apply 20 stacks of Burn at once to the final boss.

    2.8%Rare
  • Operator: Mastery

    The source page publishes this entry without an objective line.

    2.9%Rare
  • CHEF: You’ve Always Been Crazy

    As CHEF hit five airborne enemies with one instance of Roll.

    3%Rare
  • CHEF: Barbecued Bison Recipe Complete

    As CHEF complete 10 recipes by searing an oiled bison with Sear.

    3.1%Rare
  • REX: Cleared Prime Meridian

    As REX, complete the Event on Prime Meridian.

    3.1%Rare
  • False Son: Protein Heavy Diet

    As False Son, gain up to 40 Lunar Spikes through Growth.

    3.3%Rare
  • CHEF: Mastery

    As CHEF, beat the game or obliterate on Monsoon.

    3.4%Rare
  • Drifter: Trash Compactor

    As Drifter carry 20 temporary items at once.

    3.4%Rare
  • Operator: That All You Got?

    As Operator kill 4 different types of monsters with a single ricochet.

    3.6%Rare
  • Artificer: Cleared Prime Meridian

    As Artificer, complete the Event on Prime Meridian.

    3.7%Rare
  • Loader: Cleared Prime Meridian

    As Loader, complete the Event on Prime Meridian.

    3.7%Rare
  • Acrid: Cleared Prime Meridian

    As Acrid, complete the Event on Prime Meridian.

    3.8%Rare
  • Captain: Cleared Prime Meridian

    As Captain, complete the Event on Prime Meridian.

    3.8%Rare
  • MUL-T: Cleared Prime Meridian

    As MUL-T, complete the Event on Prime Meridian.

    3.8%Rare
  • Void Fiend: Cleared Prime Meridian

    As Void Fiend, complete the Event on Prime Meridian.

    3.8%Rare
  • Mercenary: Cleared Prime Meridian

    As Mercenary, complete the Event on Prime Meridian.

    4%Rare
  • Trial of Delusion

    Complete the Trial of Delusion.

    4.1%Rare
  • Bandit: Cleared Prime Meridian

    As Bandit, complete the Event on Prime Meridian.

    4.2%Rare
  • Commando: Cleared Prime Meridian

    As Commando, complete the Event on Prime Meridian.

    4.4%Rare
  • Railgunner: Cleared Prime Meridian

    As Railgunner, complete the Event on Prime Meridian.

    4.4%Rare
  • Trial of Devotion

    Complete the Trial of Devotion.

    4.4%Rare
  • False Son: Mastery

    As False Son, beat the game or obliterate on Monsoon.

    4.5%Rare
  • Engineer: Cleared Prime Meridian

    As Engineer, complete the Event on Prime Meridian.

    4.6%Rare
  • Seeker: Mastery

    As Seeker, beat the game or obliterate on Monsoon.

    4.7%Rare
  • Huntress: Cleared Prime Meridian

    As Huntress, complete the Event on Prime Meridian.

    4.7%Rare
  • False Son: Stare Them Down

    As False Son, kill 15 enemies with one activation of Laser of the Father.

    4.8%Rare
  • Operator: Putting Together a Team

    As Operator recruit 5 different drones.

    6.1%Uncommon
  • Seeker: Clear Mind

    As Seeker, meditate 20 times without missing an input in a single run.

    6.3%Uncommon
  • Lost in Transit

    The source page publishes this entry without an objective line.

    6.8%Uncommon
  • Captain: Smushed

    As Captain, kill the final boss using a Supply Beacon

    8.5%Uncommon
  • Seeker: Airborne Souls

    As Seeker, hit three or more airborne enemies with a single use of the exploding third hit of Spirit Punch.

    9.2%Uncommon
  • 「V??oid Fiend』: Mastery

    As 「V??oid Fiend』, beat the game or obliterate on Monsoon.

    9.5%Uncommon
  • Loader: The Thunderdome

    As Loader, kill three other Loaders in the Bulwark's Ambry.

    9.6%Uncommon
  • Purified Freedom

    The source page publishes this entry without an objective line.

    9.8%Uncommon
  • Experienced Rebirth

    Gain the power of another life by offering to the Shrine of Rebirth.

    10%Uncommon
  • REX: Dunked

    As REX, kill a Clay Dunestrider on Abandoned Aqueduct by throwing it into a pit.

    10.1%Uncommon
  • Bandit: Sadist

    As Bandit, kill a monster with 20 stacks of Hemorrhage.

    10.2%Uncommon
  • Mercenary: Ethereal

    As Mercenary, complete a Prismatic Trial without falling below 100% health.

    10.4%Uncommon
  • REX: Full of Life

    As REX, heal for 1000 health at once.

    10.5%Uncommon
  • Order Up!

    The source page publishes this entry without an objective line.

    10.6%Uncommon
  • Railgunner: Mastery

    As Railgunner, beat the game or obliterate on Monsoon.

    10.7%Uncommon
  • Railgunner: Annihiliator

    As Railgunner, deal 1,000,000 damage in one shot.

    10.8%Uncommon
  • MUL-T: Gotcha!

    As MUL-T, land the killing blow on an Imp Overlord with the Preon Accumulator.

    11%Uncommon
  • REX: Mastery

    As REX, beat the game or obliterate on Monsoon.

    11%Uncommon
  • REX: Bushwhacked

    As REX, complete an entire teleporter event while under 50% health.

    11.3%Uncommon
  • MUL-T: Seventh Day

    As MUL-T, clear the Void Fields on Stage 7 or later.

    11.3%Uncommon
  • Trial of Frailty

    Complete the Trial of Frailty.

    11.6%Uncommon
  • King of the Hill

    The source page publishes this entry without an objective line.

    11.7%Uncommon
  • The Demons And The Crabs

    Kill 20 Hermit Crabs by chasing them off the edge of the map.

    12%Uncommon
  • Trial of Evolution

    Complete the Trial of Evolution.

    12.4%Uncommon
  • Acrid: Mastery

    As Acrid, beat the game or obliterate on Monsoon.

    12.5%Uncommon
  • Bandit: B&E

    As Bandit, kill the final boss with 'Lights Out'.

    12.6%Uncommon
  • Loader: Swing By

    As Loader, reach and proceed through the Celestial Portal in 25 minutes or less.

    12.7%Uncommon
  • Trial of Spite

    Complete the Trial of Spite.

    12.7%Uncommon
  • Loader: Mastery

    As Loader, beat the game or obliterate on Monsoon.

    12.9%Uncommon
  • Trial of Soul

    Complete the Trial of Soul.

    12.9%Uncommon
  • Acrid: Bad Medicine

    As Acrid, land the final blow on a Scavenger.

    13%Uncommon
  • Captain: Mastery

    As Captain, beat the game or obliterate on Monsoon.

    13.1%Uncommon
  • Trial of Metamorphosis

    Complete the Trial of Metamorphosis.

    13.1%Uncommon
  • Bandit: Mastery

    As Bandit, beat the game or obliterate on Monsoon.

    13.1%Uncommon
  • Trial of Enigma

    Complete the Trial of Enigma.

    13.2%Uncommon
  • Trial of Death

    Complete the Trial of Death.

    13.2%Uncommon
  • Artificer: Mastery

    As Artificer, beat the game or obliterate on Monsoon.

    13.3%Uncommon
  • MUL-T: Mastery

    As MUL-T, beat the game or obliterate on Monsoon.

    13.3%Uncommon
  • Trial of Chaos

    Complete the Trial of Chaos.

    13.6%Uncommon
  • Mercenary: Mastery

    As Mercenary, beat the game or obliterate on Monsoon.

    14.2%Uncommon
  • Trial of Vengeance

    Complete the Trial of Vengeance.

    14.6%Uncommon
  • Artificer: Chunked!

    As Artificer, fully defeat the teleporter boss in a one-second burst of damage.

    14.7%Uncommon
  • Commando: Mastery

    As Commando, beat the game or obliterate on Monsoon.

    15%Uncommon
  • Engineer: Mastery

    As Engineer, beat the game or obliterate on Monsoon.

    15%Uncommon
  • Railgunner: Marksman

    As Railgunner, fire 30 consecutive sniper shots without missing a Weak Point.

    15.1%Uncommon
  • Commando: Incorruptible

    As Commando, clear 20 stages in a single run without picking up any Lunar items.

    15.5%Uncommon
  • Captain: Worth Every Penny

    As Captain, repair and recruit a TC-280 Prototype.

    15.6%Uncommon
  • Acrid: Pandemic

    As Acrid, inflict Poison 1000 total times.

    15.6%Uncommon
  • Trial of Glass

    Complete the Trial of Glass.

    15.6%Uncommon
  • Trial of Dissonance

    Complete the Trial of Dissonance.

    15.6%Uncommon
  • Captain: Wanderlust

    As Captain, visit 10 different environments in a single run.

    15.8%Uncommon
  • Railgunner: Trickshot

    As Railgunner, get 3 kills with a single Supercharge shot while airborne.

    16.4%Uncommon
  • Commando: Rolling Thunder

    As Commando, land the killing blow on an Overloading Worm.

    16.9%Uncommon
  • Huntress: Mastery

    As Huntress, beat the game or obliterate on Monsoon.

    17%Uncommon
  • Trial of Kin

    Complete the Trial of Kin.

    17%Uncommon
  • Huntress: Piercing Wind

    As Huntress, start and finish either Rallypoint Delta or Scorched Acres without falling below 100% health.

    18%Uncommon
  • Artificer: Massacre

    As Artificer, perform a multikill of 20 enemies.

    18.6%Uncommon
  • Prismatically Aligned

    Complete a Prismatic Trial.

    19.4%Uncommon
  • Loader: Earthshatter

    As Loader, land a Charged Gauntlet hit at 300mph or higher.

    19.9%Uncommon
  • Glorious Battle

    Charge the Teleporter with less than 10% health.

    20.3%Common
  • Engineer: 100% Calculated

    As Engineer, defeat the teleporter boss in less than 5 seconds after it spawns.

    21%Common
  • MUL-T: Pest Control

    As MUL-T, defeat two Beetle Queens without leaving the teleporter zone.

    21.4%Common
  • Trial of Swarms

    Complete the Trial of Swarms.

    21.6%Common
  • Mercenary: Demon of the Skies

    As Mercenary, don't touch the ground for 30 seconds.

    21.9%Common
  • Dragged Below

    Escape the Planetarium or complete wave 50 in Simulacrum.

    22.4%Common
  • Artificer: Orbital Bombardment

    As Artificer, kill 15 enemies before touching the ground.

    22.5%Common
  • Acrid: Easy Prey

    As Acrid, land the killing blow on 50 total enemies that have 1 hit point left.

    23.3%Common
  • The Calm

    Beat the game on Monsoon difficulty.

    23.7%Common
  • Trial of Sacrifice

    Complete the Trial of Sacrifice.

    24%Common
  • The Long Road

    Complete 20 stages in a single run.

    24.4%Common
  • Huntress: One Shot, One Kill

    As Huntress, collect and carry 12 Crowbars at once.

    24.4%Common
  • [REDACTED]

    Open the Timed Security Chest on Rallypoint Delta.

    24.9%Common
  • Engineer: Better With Friends

    As Engineer, recruit 12 minions at one time.

    26.5%Common
  • Engineer: Zero Sum

    As Engineer, finish charging the teleporter with zero monsters remaining on the stage.

    26.6%Common
  • Bandit: Classic Man

    As Bandit, successfully use 'Lights Out' to reset your cooldowns 15 times in a row.

    27.3%Common
  • Power Plant

    Repair the broken robot with an Escape Pod's Fuel Array.

    28.2%Common
  • Newtist

    Discover and activate 8 unique Newt Altars.

    28.5%Common
  • Mercenary: Flash of Blades

    As Mercenary, use 20 abilities in 10 seconds.

    28.5%Common
  • Deicide

    Defeat an Elite boss on Monsoon difficulty.

    30.6%Common
  • Trial of Command

    Complete the Trial of Command.

    31.8%Common
  • Commando: Godspeed

    As Commando, fully charge the first-stage teleporter before the timer hits 5 minutes.

    33.4%Common
  • Moon Worshipper

    Carry 5 Lunar items in a single run.

    34.5%Common
  • Huntress: Finishing Touch

    As Huntress, land a killing blow with every possible hit of a single glaive.

    34.9%Common
  • Death Do Us Part

    Discover the hidden chamber in the Abandoned Aqueduct.

    35.2%Common
  • Automation Activation

    Activate 6 turrets in a single run.

    35.7%Common
  • Naturopath

    Without healing, reach and complete the 3rd Teleporter event.

    35.9%Common
  • Trial of Honor

    Complete the Trial of Honor.

    36.3%Common
  • Her Concepts

    Find the Altar to N'kuhana.

    37.7%Common
  • ...Maybe One More.

    Duplicate the same item 7 times in a row with a 3D Printer.

    40.2%Common
  • ...To Be Left Alone

    Stabilize the Cell in the Void Fields.

    40.7%Common
  • One with the Woods

    Fully upgrade a Shrine of the Woods.

    41.3%Common
  • Never Back Down

    In 4 consecutive stages don’t leave the teleporter radius until it is fully charged.

    41.6%Common
  • Blackout

    Defeat the unique guardian of Gilded Coast without any beacons deactivating.

    43%Common
  • True Respite

    Obliterate yourself at the Obelisk..

    45.9%Common
  • Cleanup Duty

    Destroy 20 flying rocks in Sky Meadow.

    46.3%Common
  • Cut Down

    Defeat 500 elite monsters.

    47.2%Common
  • Rapidfire

    Reach +200% attack speed.

    47.4%Common
  • Ascendant

    Defeat the Teleporter bosses after activating 2 Shrines of the Mountain.

    50.3%Most players
  • Warm For Life

    Die three times while burning.

    50.4%Most players
  • Warmonger

    Complete 3 Combat Shrines in a single stage.

    51%Most players
  • Washed Away

    Beat the game.

    52.1%Most players
  • Mechanic

    Repair 30 drones or turrets.

    52.4%Most players
  • I Love Dying!

    Die 20 times.

    52.7%Most players
  • Going Fast Recommended

    Reach +300% movespeed (includes sprinting).

    52.9%Most players
  • Cosmic Explorer

    Discover and enter three unique portals.

    53%Most players
  • Slaughter

    Defeat 3000 enemies.

    53.1%Most players
  • Pause.

    Free the survivor suspended in time.

    53.3%Most players
  • Guidance Offline

    Defeat the unique guardian of Siren's Call.

    54.1%Most players
  • Flawless

    Fully charge a Teleporter without getting hit.

    54.3%Most players
  • Multikill!

    Kill 15 enemies simultaneously.

    56.5%Most players
  • Engineering Perfection

    Complete 30 stages.

    57%Most players
  • Deja Vu?

    Loop back to the first stage.

    60.7%Most players
  • Blockade Breaker

    Kill 15 boss monsters in a single run.

    62.2%Most players
  • Bookworm

    Collect 10 Monster or Environment Logs.

    63%Most players
  • Macho

    Deal 5000 damage in one shot.

    64.3%Most players
  • "Is This Bugged?"

    Fail the Shrine of Chance 3 times in a row.

    65.5%Most players
  • Verified

    Complete the first Teleporter event 5 times.

    66.4%Most players
  • Keyed Up

    Defeat the Teleporter boss under 15 seconds.

    67.2%Most players
  • Experimenting

    Pick up 5 different types of Equipment.

    72.5%Most players
  • Funded!

    Collect $30,480 total gold.

    73.5%Most players
  • Learning Process

    Die 5 times.

    75%Most players
  • The Lone Survivor

    Stay alive for 30 consecutive minutes.

    77.3%Most players
  • Warrior

    Reach and complete the 3rd Teleporter event without dying.

    77.7%Most players
  • The Basics

    Discover 10 unique white items.

    82.3%Most players
  • Advancement

    Complete a Teleporter event.

    86.8%Most players
  • Elite Slayer

    Defeat an Elite-type monster.

    90.8%Most players

Reading an unlock rate honestly

The denominator matters more than the number. These percentages are calculated across everyone who owns the game, which includes a large population that launched it once and never returned. That drags every figure down, so a 40% achievement is not evidence that it is hard — it is evidence that most owners never got that far.

Expansion achievements carry a second distortion in the other direction: they are only visible to players who own that expansion, so their percentages are computed against a smaller and more committed group. The practical consequence is that comparing a base-game achievement with an expansion one is not a fair fight, and the bands are only meaningful within a release.

What is still open

  • 成就与 Steam API 返回的成就标识并非一一对应(API 返回条目数与页面总数不同),两者未做映射。
  • 各成就所属的 DLC 未标注。
  • 未标注哪些属于隐藏成就(Steam 页面对隐藏成就同样直接显示名称与描述)。

Frequently asked

How many achievements does Risk of Rain 2 have?
205 on the platform statistics page, counting the base game and every expansion that has shipped so far.
What do the percentages mean?
Each figure is the share of players worldwide who have unlocked that achievement. A low number means few people have it, which makes the list a useful map of what is actually hard rather than what merely sounds hard.
Why do some achievements show a very low percentage?
Achievements added by an expansion are only available to players who own it, and some of them sit behind long challenge chains. Both effects push the percentage down without making the achievement obscure.
Does the checklist save anywhere?
Ticks are stored in your own browser and are never sent anywhere. Clearing your browser data removes them, and there is no account to sign in to.