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Abyss

AchievementRepentanceUnlock unknown

Achievement details

Achievement number: 597
Description: ???
Requirement: Defeat Delirium as Tainted Apollyon

How do you unlock Abyss?

In The Binding of Isaac, Abyss is unlocked by earning the Delirium completion mark as Tainted Apollyon.

Structured pathSource-backed requirements are mapped into trackable steps.

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Tainted Apollyon → Delirium (normal)
1. Defeat Hush to unlock The Void. source
2. A Void portal can appear after a major boss; defeating Hush guarantees one. source
3. Defeat Delirium, the main boss of The Void. source
- Tainted Apollyon
  - The Empty
    How to unlock: Use Red Key (etc.) to open the hidden closet in Home as Apollyon

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What unlocking Abyss leads to

Source: bindingofisaacrebirth.wiki.gg

Imported 2026-09-13