Big Baby
AchievementAfterbirthUnlock unknown
Achievement details
- Achievement number
- 216
- Description
- Unlocked a new co-player baby.
- Requirement
- Defeat Mega Satan as Lilith
How do you unlock Big Baby?
In The Binding of Isaac, Big Baby is unlocked by earning the Mega Satan completion mark as Lilith (Character).
Structured pathSource-backed requirements are mapped into trackable steps.
Unlocked a new co-player baby.
See the full unlock path for Big Baby — 6 steps- ??? or The Lamb must be defeated once for the Golden Gate to spawn. source
- Open the Golden Gate by combining Key Piece 1 and Key Piece 2 into the Golden Key, or by using Dad's Key or another gate-opening effect. source
- Reach the starting room of Chest or Dark Room, pass through the Golden Gate, and defeat Mega Satan. source
What unlocking Big Baby leads to
Source: bindingofisaacrebirth.wiki.gg
Imported 2026-09-13