Forgotten Lullaby
AchievementRepentanceUnlock unknown
Achievement details
- Achievement number
- 408
- Description
- Get that song out of her head.
- Requirement
- Blow up The Siren's skull after defeating her
How do you unlock Forgotten Lullaby?
Source text onlyThe instruction is sourced, but its steps are not mapped yet.
Get that song out of her head.
Verified requirement
Blow up The Siren's skull after defeating her
A structured unlock path has not been mapped for this achievement.
What unlocking Forgotten Lullaby leads to
Source: bindingofisaacrebirth.wiki.gg
Imported 2026-09-13