['Isaac : Unlocked by default.', 'Magdalene : Have seven or more Heart-Containers at once.', 'Cain : Have 55 or more cents/pennys at once.', 'Judas : Defeat Satan.', "??? aka Blue Baby : Defeat Mom's Heart 10 times.", 'Eve : Beat two floors in a row without picking up any hearts.', 'Samson : Beat two floors in a row without taking any damage.']