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Lucky Sack

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How do you unlock Lucky Sack?

In The Binding of Isaac, Lucky Sack is unlocked by earning the Mother completion mark as Tainted Cain.

Structured pathSource-backed requirements are mapped into trackable steps.

Spawns a Grab Bag upon traveling to the next floor.

Lucky Sack (Achievement)
- Tainted Cain → Mother (normal)
  1. Defeat Hush 3 times to unlock A Secret Exit. source
  2. After A Secret Exit is unlocked, a locked door to Downpour appears after completing Basement/Cellar/Burning Basement I or II. source
  3. Collect Knife Piece 1 in Downpour/Dross II. source
  4. Collect Knife Piece 2 in Mines/Ashpit II. source
  5. After defeating Mom in Mausoleum/Gehenna II, stab the flesh door that appears with the knife familiar to open it. source
  6. Defeat the Mausoleum version of Mom's Heart behind the flesh door, then reach Corpse II and defeat Mother. source
  - Tainted Cain

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What unlocking Lucky Sack leads to

Nothing depends on this yet.

Source: bindingofisaacrebirth.wiki.gg

Imported 2026-09-13