The Binding of Isaac: Rebirth
637 Achievements
800-800h
Steam
Forgotten Lullaby
Get that song out of her head.
17.1%
How to unlock the Forgotten Lullaby achievement in The Binding of Isaac: Rebirth - Definitive Guide
redjarman
TrueSteamAchievements
TrueSteamAchievements
Unlocked by blowing up The Siren's skull after defeating her.
She's sometimes the boss of Mausoleum 1. To get there, after you beat the boss in The Depths 1 or The Mines 2, a door will appear with a spike on it. Walk into it to sacrifice 2 hearts and it will open the path to Mausoleum.
When she dies, her skin will melt off and her skull will be left on the ground. Blow it up with a bomb to unlock this
She's sometimes the boss of Mausoleum 1. To get there, after you beat the boss in The Depths 1 or The Mines 2, a door will appear with a spike on it. Walk into it to sacrifice 2 hearts and it will open the path to Mausoleum.
When she dies, her skin will melt off and her skull will be left on the ground. Blow it up with a bomb to unlock this
