1. The Binding of Isaac: Rebirth Achievements
  2. Forgotten Lullaby achievement
The Binding of Isaac: Rebirth

The Binding of Isaac: Rebirth

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Forgotten Lullaby achievement in The Binding of Isaac: Rebirth

Forgotten Lullaby

Get that song out of her head.

Forgotten Lullaby0
1 guide

How to unlock the Forgotten Lullaby achievement

  • redjarmanredjarman
    03 May 2021 16 Apr 2021 16 Apr 2021
    0 0 0
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    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

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