Skip to content

26%

Mom's Lock

AchievementRepentanceUnlock unknown

Achievement details

Achievement number: 548
Description: ???
Requirement: Defeat Isaac, ???, Satan, and The Lamb as Tainted Isaac

How do you unlock Mom's Lock?

In The Binding of Isaac, Mom's Lock is unlocked by earning every normal-mode completion mark as Tainted Isaac.

Structured pathSource-backed requirements are mapped into trackable steps.

???

See the full unlock path for Mom's Lock — 6 steps

All of
- Tainted Isaac → Isaac (normal)
  - Tainted Isaac
- Tainted Isaac → ??? (normal)
  - Tainted Isaac
- Tainted Isaac → Satan (normal)
  - Tainted Isaac
- Tainted Isaac → 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
  - Tainted Isaac

Show full path Show missing

What unlocking Mom's Lock leads to

Source: bindingofisaacrebirth.wiki.gg

Imported 2026-09-13