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???'s Soul

AchievementRebirthUnlock unknown

Achievement details

Achievement number: 73
Description: Unlocked a new item.
Requirement: Defeat The Lamb as ???

How do you unlock ???'s Soul?

In The Binding of Isaac, ???'s Soul is unlocked by earning the The Lamb completion mark as ??? (Character).

Structured pathSource-backed requirements are mapped into trackable steps.

Unlocked a new item.

??? (Character) → The Lamb (normal)
1. Defeat Satan 5 times to unlock The Negative. source
2. The Negative is a guaranteed drop from Mom; take it, then defeat Satan in Sheol and touch the chest to enter Dark Room. source
3. Find and defeat The Lamb in Dark Room. source
- ??? (Character)
  - ??? (Achievement)

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What unlocking ???'s Soul leads to

Source: bindingofisaacrebirth.wiki.gg

Imported 2026-09-13