The Binding of Isaac
99 Achievements
250-260h
Steam
???s Soul
Details for this achievement will be revealed once unlocked
5.5%
How to unlock the ???s Soul achievement in The Binding of Isaac - Definitive Guide
ClownTastic08
TrueSteamAchievements
TrueSteamAchievements
Although this item is supposed to be awarded by beating The Chest with ??? (Blue Baby) you actually unlock the achievement by beating The Chest with Cain due to a bug in the games achievement unlock system, the item is unlocked by beating The Chest with Eve.