The Womb
Next upDefeat Mom.
Reach Depths II and defeat Mom.
Sources:AchievementsWomb
Achievement
Defeat Mom's Heart or It Lives! on Hard mode as Judas.
In-game: “Unlocked a new co-player baby.”
Sources:AchievementsHard modeMom's Heart
Defeat Mom.
Reach Depths II and defeat Mom.
Sources:AchievementsWomb
Defeat Satan.
After: The Womb
Defeat Mom's Heart or It Lives! on Hard mode as Judas.
After: Judas, The Womb