Magdalene
ReadyHave 7 or more red heart containers at the same time.
Achievement
Defeat Mother as Tainted Magdalene.
Sources:AchievementsMotherCorpse
Have 7 or more red heart containers at the same time.
Defeat Mom.
Reach Depths II and defeat Mom.
Sources:AchievementsWomb
Defeat Mom's Heart 10 times.
After: The Womb
Defeat Isaac 5 times.
After: The Womb
Defeat Hush 3 times.
After: The Womb, Blue Womb
Defeat Mother.
After: A Secret Exit
Open the hidden closet in Home as Magdalene.
After: Magdalene, The Polaroid, A Strange Door
Defeat Mother as Tainted Magdalene.
After: The Dauntless, A Secret Exit