Cain
ReadyHold 55 coins at the same time.
Achievement
Defeat Mega Satan as Cain.
In-game: “Unlocked a new co-player baby.”
Sources:AchievementsMega Satan
Hold 55 coins at the same time.
Defeat Mom.
Reach Depths II and defeat Mom.
Sources:AchievementsWomb
Defeat Isaac 5 times.
After: The Womb
Complete Chapter 6 (defeat ??? in the Chest or The Lamb in the Dark Room).
After: The Womb, The Polaroid
Defeat Mega Satan as Cain.
After: Cain, Angels, The Womb, The Polaroid