Achievements are rewarded to the player after completing challenges or reaching certain milestones in The Binding of Isaac. There are a total of 84 achievements in the game, 52 from the main game and a further 32 from the Wrath of the Lamb expansion.
Note that the game saves periodically over time, and also saves when you use the in-game command to exit. For your own sake, make sure to always use the in-game command to exit the game, as opposed to force-quitting, clicking the X, or so on. It may be advisable to exit after a winning run or other major unlock, even if you plan to continue playing, simply as a precaution.
Achievements on the Mac version will be counted, but will not unlock in Steam until the game is launched in Windows.
List of Achievements
|Name||Description||Image||How To Unlock|
|The Radioactive Spider||Complete The Basement||Complete the basement.|
|Monstro's Tooth||Defeat all bosses in the basement|| Defeat all types of bosses in The Basement.|
(Duke of Flies, Monstro, Gemini, Larry Jr.)
|The Spelunker||Complete The Caves||Defeat the Boss in Caves 2.|
|Lil Chubby||Defeat all bosses in the caves|| Defeat all types of bosses in Caves.|
(Fistula, Gurdy, Peep, Chub)
|I Killed Mom!||Kill Mom...||Defeat the boss in The Depths 2.|
|Loki's Horns||Defeat all bosses in The Depths|| Defeat all types of bosses in The Depths.|
(Monstro II, Loki, Mom)
|Small Rock||I like to break things...||Destroy 50 rocks over multiple playthroughs.|
|The Bean||You don't wanna know where this bean has been...||Destroy 50 poop piles over multiple playthroughs.|
|Mom's Bottle Of Pills||Mom needs her pills! Donate blood||Use Blood Donation Machines 20 times over multiple playthroughs.|
|The Gamekid||I lost mine in the Arcade...||Enter different arcades 10 times over multiple playthroughs.|
|The Common Cold||Dirty needles... eww||Collect two of these in one playthrough: Roid Rage, The Virus, and Growth Hormones.|
|Mr. Mega!||Kids shouldn't play with matches||Destroy 30 X Marks the Spot rocks over multiple playthroughs.|
|The Book of Sin||Destroy the 7 sins!||Defeat all of The Seven Deadly Sins over multiple playthroughs.|
|Mom's Contacts||Stay out of mom's things!||Collect Mom's Eye and any other Mom's item in a single playthrough.|
|The Parasite||Kids shouldn't play with dead things...||Collect two "dead items" (Bob's Rotten Head, Dead Cat, Max's Head, Tammy's Head) in the same playthrough.|
|The Necronomicon||Call Death upon all of them!||Use the XIII Death Tarot Card four times over multiple playthroughs.|
|The Halo||Give Mom a taste of her own medicine!||Defeat Mom or Mom's Heart with The Bible. (Using it will instantly kill her.)|
|The Bandage||Make a Super Meat Boy!||Kill 4 Horsemen of the Apocalypse in a single playthrough.|
|The Shears||I've lost my head one too many times...||Die 100 times.|
|Maggy's Wig||Collect 7+ container hearts in one play through||Have a minimum of seven heart containers in a single playthrough.|
|Cain's Eyepatch||Collect 55+ pennies in one play through||Have 55 or more pennies on hand at once.|
|Judas' Fez||Complete the full game||Defeat the boss in The Womb 2.|
|Eve's Dead Bird||Make 2 deals with the devil in one play through||Make two deals with the devil in a single playthrough.|
|???||Complete the full game 10 times||Defeat the Boss in The Womb 2 a tenth time.|
|My Head Hurts...||Defeat Steven.||Defeat the alternate Boss Steven.|
|I need a hug...||Defeat C.H.A.D..||Defeat the alternate Boss C.H.A.D..|
|I Have Sticker Fingers...||Defeat Gish.||Defeat the alternate Boss Gish.|
|The Noose||Complete the full game 2 times||Defeat the Boss in The Womb 2 a second time.|
|The Nail||Complete the full game 3 times||Defeat the Boss in The Womb 2 a third time.|
|The Quarter||Complete the full game 4 times||Defeat the Boss in The Womb 2 a fourth time.|
|The Fetus||Complete the full game 5 times||Defeat the Boss in The Womb 2 a fifth time.|
|Everything's Terrible!||Complete the full game 6 times||Defeat the Boss in The Womb 2 a sixth time.|
|The Wafer||Complete the full game 7 times||Defeat the Boss in The Womb 2 a seventh time.|
|Money = Power||Complete the full game 8 times||Defeat the Boss in The Womb 2 an eighth time.|
|It Lives!||Complete the full game 9 times||Defeat the Boss in The Womb 2 a ninth time.|
|The Cross||Complete the full game with Maggy.||Defeat the Boss in The Womb 2 with Maggy.|
|The Bag||Complete the full game with Cain.||Defeat the Boss in The Womb 2 with Cain.|
|The Robo-Baby||Complete the full game with Judas||Defeat the Boss in The Womb 2 with Judas.|
|The Razor Blade||Complete the womb with Eve||Defeat the boss in The Womb 2 with Eve.|
|The D6||Complete the full game with ???.||Defeat the Boss in The Womb 2 with ???.|
|Golden God||100% the game||Collect every item and secret in the game.
This achievement can be gained by collecting all but one of the items if you have defeated Krampus and found A Lump of Coal.
|Basement Boy||Complete the Basement without taking damage||Complete the Basement without taking damage.|
|Spelunker Boy||Complete the Caves without taking damage||Complete the Caves without taking damage.|
|Dark Boy||Complete the Depths without taking damage||Complete the Depths without taking damage.|
|Mama's Boy||Complete the Womb without taking damage||Complete the Womb without taking damage.|
|Moms Knife||Complete Sheol with Isaac||Defeat the boss in Sheol with Isaac.|
|The Guardian Angel||Complete Sheol with Maggy||Defeat the boss in Sheol with Magdalene.|
|The Bomb Bag||Complete Sheol with Cain||Defeat the boss in Sheol with Cain.|
|The Monster Manual||Complete Sheol with Judas||Defeat the boss in Sheol with Judas.|
|The Demon Baby||Complete Sheol with Eve||Defeat the boss in Sheol with Eve.|
|Forget Me Now||Complete Sheol with ???||Defeat the boss in Sheol with ??? (Blue Baby).|
|A Gift From Krampus||Find Krampus in Satans room for a gift!|
Achievements added in Wrath of the Lamb
|Name||Description||Image||How To Unlock|
|Samson||Kill Mom but pass on 2 treasure room items.||Skip two Treasure Rooms and defeat Mom.|
|Blood Lust||Kill Mom's Heart with Samson.||Defeat Mom's Heart or It Lives in The Womb 2 with Samson.|
|Blood Rights||Kill Satan with Samson||Defeat Satan in Sheol with Samson.|
|The D20||Complete the final chapter with Isaac.||Defeat Isaac in the Cathedral with Isaac.|
|The Celtic Cross||Complete the final chapter with Maggy.||Defeat Isaac in the Cathedral with Maggy.|
|Abel||Complete the final chapter with Cain.||Defeat Isaac in the Cathedral with Cain.|
|The Curved Horn||Complete the final chapter with Judas.||Defeat Isaac in the Cathedral with Judas.|
|The Sacrificial Knife||Complete the final chapter with Eve.||Defeat Isaac in the Cathedral with Eve.|
|The Rainbow Baby||Complete the final chapter with ???.||Defeat Isaac in the Cathedral with ???.|
|The Bloody Penny||Complete the final chapter with Samson.||Defeat Isaac in the Cathedral with Samson.|
|The Candle||Complete Challenge 1||Complete Challenge 1: Defeat Mom with Curse of Darkness on every floor.|
|The Lucky Toe||Complete Challenge 2||Complete Challenge 2: Defeat Mom while starting out with -2 Luck.|
|The Burnt Penny||Complete Challenge 3||Complete Challenge 3: Defeat Mom with Curse of the Labyrinth on every floor.|
|Guppys Tail||Complete Challenge 4||Complete Challenge 4: Defeat Mom, starting out with the Dead Cat item.|
|The Fish Head||Complete Challenge 5||Complete Challenge 5: Defeat Mom's Heart or It Lives, starting out with The Mulligan and Infestation.|
|Mega Fetus||Complete Challenge 6||Complete Challenge 6: Defeat Mom's Heart or It Lives, starting out with Dr Fetus and the Doctor's Remote.|
|Super SMB Fan||Complete Challenge 7||Complete Challenge 7: Defeat Mom's Heart or It Lives, starting out with a stage 4 Cube Of Meat.|
|The Spider Butt||Complete Challenge 8||Complete Challenge 8: Defeat Mom's Heart or It Lives, starting out with Mutant Spider and Spider's Bite.|
|The Counterfeit Coin||Complete Challenge 9||Complete Challenge 9: Defeat Satan, starting out with the Holy Grail and The Halo.|
|Dad's Key||???||Defeat the final boss in The Chest.|
Transform Isaac into a Cat. For details, see Guppy.
Complete the Cathedral six times. You may use different characters to do so.
|Daddys Love||???||Complete challenge 10: Beat Isaac with no Start Item and no Item Rooms.|
|Platinum God!||100% the game.||Get all items and all secrets, including the Wrath of the Lamb expansion exclusive content.
(If you have Ghost Baby, you will need one less item.)
|Isaacs Head||???||Complete The Chest with Isaac.|
|Maggys Faith||???||Complete The Chest with Magdalene.|
Complete The Chest with Cain.
(Bugged as of 1.48, unlocks when beating "The Chest" with Judas.)
Complete The Chest with Judas.
(Bugged as of 1.48, unlocks when beating "The Chest" with Eve.)
|Eves Bird Foot||???||
Complete The Chest with Eve.
Complete The Chest with ???.
Complete The Chest with Samson.
|The Left Hand||???||Defeat Ultra Pride.|
- The game will count a single playthrough as two "completions" if the player somehow accesses Sheol (e.g. through a Devil Room in Womb 2 or by use of "We Need to Go Deeper") and successfully defeats Satan prior to the 10th completion of the game. Doing so will unlock as many as three endings per playthrough, and if done on the 9th playthrough can even unlock ??? (and The Poop) without the player having ever defeated It Lives.
- For some users, achievements may never unlock at all. This can be fixed by closing The Binding Of Isaac, going to your Binding Of Isaac local files, deleting "FlashAchievements.exe", going to your Steam library, right clicking on The Binding Of Isaac, clicking on "Properties", going to the Local Files tab, and verifying the integrity of the game cache. Once Steam re-downloads the FlashAchievements.exe file, all of the missing achievements will be unlocked once you start up TBOI. This has to be re-done for any future locked achievements.
- Please note that several of the Wrath of the Lamb achievements are bugged and can be found even without having them unlocked:
- When you defeat the Headless Horseman, you may get the achievement for defeating C.H.A.D..
- The Sacrificial Knife may be unlocked if you use a Joker Card or the We Need to Go Deeper! item on a The Womb XL floor to go directly to Sheol and then beat Satan with Eve (as though you had beaten Isaac). (Needs confirmation if it works with other characters on a similar situation.)
- If you defeat a boss while you have no Heart Containers, it is treated as if you won as ???, even if you were someone else. This applies only to Secrets; achievements are still unlocked normally, excluding any other bugs. (For example, beating The Chest as Eve - a message appears indicating the "???'s Soul" Secret is unlocked, but the unlocked achievement is "Judas' Tongue".)