Missing Poster

AchievementRebirthUnlock unknown

Achievement details

In The Binding of Isaac, Missing Poster is unlocked by earning the The Lamb completion mark as Isaac (Character).

Structured pathSource-backed requirements are mapped into trackable steps.

Unlocked a new item.

Isaac (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
- Isaac (Character)

Imported 2026-09-13