The Womb
Next upDefeat Mom.
Reach Depths II and defeat Mom.
Sources:AchievementsWomb
Achievement
Unlocked in the Dark Room's Grave Room, on The Forgotten's unlock quest.
In-game: “Unlocked a new item.”
Sources:AchievementsGrave Room
Defeat Mom.
Reach Depths II and defeat Mom.
Sources:AchievementsWomb
Defeat Satan 5 times.
After: The Womb
Unlocked in the Dark Room's Grave Room, on The Forgotten's unlock quest.
After: The Womb, The Negative