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Isaac Progression

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Unofficial fan project. Not affiliated with the developers of The Binding of Isaac.

Game facts are sourced from the Binding of Isaac Rebirth Wiki (CC BY-SA), and each guide links to its sources. Your progress is saved only in this browser.

Achievement

Isaac's Head

Complete the Boss Rush as Isaac.

In-game: “Unlocked a new item.”

Sources:Achievements Boss Rush

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Stage 1

Isaac's Head
Next up
Complete the Boss Rush as Isaac.
Play as Isaac
Defeat Mom in Depths II within 20 minutes of starting the run, then go through the Boss Rush door and complete it.
Beating Mom in Mausoleum or Gehenna II within 25 minutes also opens it. Mama Mega! or Mega Bean open the door even after the time limit.
Sources:Achievements Boss Rush