Binding of Isaac Achievement: Book of the Dead
In-Game Secret Number
Collect every item in the game, unlock all secrets and endings, and complete the Bestiary
Unlocked a new challenge.
Defeat Isaac 5 times
Defeat Ultra Greedier as Keeper
Have 20 blue flies at the same time
Unlocked even more bosses!
Defeat ??? as 6 different characters
Have both the Broken Watch and the Stop Watch in your collection
Defeat The Lamb as The Forgotten
Defeat Ultra Greedier as Apollyon
Defeat Delirium as Azazel
Defeat Ultra Greedier as The Lost
Blow up doors and secret room walls 50 times
Unlocked super special rocks.
Get a 5-win streak, using a different character for each win
Unlocked a new co-player baby.
Defeat Mega Satan as Apollyon
Use Pandora's Box in the Dark Room
Die to your own explosion from Ipecac, Bob's Rotten Head, or Horf! pill
Defeat Ultra Greedier as Eve
Use I - The Magician or Telepathy for Dummies while already having homing tears (Sources of this effect include I - The Magician, Telepathy for Dummies, Spoon Bender, Sacred Heart, or Godhead).
Spawn three charmed enemies in the same room
Unlocked new bosses!
Defeat ??? as 3 different characters