Lost Soul
AchievementRepentanceUnlock unknown
Achievement details
- Achievement number
- 460
- Description
- Complete the Corpse with the Lost.
- Requirement
- Defeat Mother as The Lost
How do you unlock Lost Soul?
In The Binding of Isaac, Lost Soul is unlocked by earning the Mother completion mark as The Lost (Character).
Structured pathSource-backed requirements are mapped into trackable steps.
Complete the Corpse with the Lost.
See the full unlock path for Lost Soul — 8 steps- Defeat Hush 3 times to unlock A Secret Exit. source
- After A Secret Exit is unlocked, a locked door to Downpour appears after completing Basement/Cellar/Burning Basement I or II. source
- Collect Knife Piece 1 in Downpour/Dross II. source
- Collect Knife Piece 2 in Mines/Ashpit II. source
- After defeating Mom in Mausoleum/Gehenna II, stab the flesh door that appears with the knife familiar to open it. source
- Defeat the Mausoleum version of Mom's Heart behind the flesh door, then reach Corpse II and defeat Mother. source
What unlocking Lost Soul leads to
Source: bindingofisaacrebirth.wiki.gg
Imported 2026-09-13