Here is the full list of all 33 Mary Skelter 2 achievements.
Filled the Jail Creature Manual with 10 creatures. (Mary Skelter 2)
Entered Massacre mode for the first time. (Mary Skelter 2)
Obtained all Trophies! (Mary Skelter 2)
Cleared the Aquarium Ruins area. (Mary Skelter 2)
Cleared the Dorm area. (Mary Skelter 2)
Cleared the Waterside area. (Mary Skelter 2)
Cleared the Temple area. (Mary Skelter 2)
Cleared the Art Alley area. (Mary Skelter 2)
Cleared the Downtown area. (Mary Skelter 2)
Cleared the Station Grounds area. (Mary Skelter 2)
Cleared the City Streets area. (Mary Skelter 2)
Cleared the Graveyard area. (Mary Skelter 2)
Unlocked the Bad Ending. (Mary Skelter 2)
Unlocked the True Ending. (Mary Skelter 2)
Filled the Jail Creature Manual with 80% of all creatures. (Mary Skelter 2)
Used Embrace 10 times. (Mary Skelter 2)
Activated Nightmare Jack's Nightmare Zone 10 times. (Mary Skelter 2)
Satisfied the Jail's Appetite. (Mary Skelter 2)
Satisfied the Jail's Sleep. (Mary Skelter 2)
Satisfied the Jail's Libido. (Mary Skelter 2)
Unlock 5 of the heroines' jobs. (Mary Skelter 2)
Collected 100,000 Gold. (Mary Skelter 2)
Cleared 10 work orders. (Mary Skelter 2)
Cleared 50% of all work orders. (Mary Skelter 2)
Used Otsuu's Counseling 30 times. (Mary Skelter 2)
Get used to using the Blood Farm. (Mary Skelter 2)
Blood Devolution reached Level 80. (Mary Skelter 2)
Defeated 8 Nightmares. (Mary Skelter 2)
Grew and entered a hidden floor. (Mary Skelter 2)
Raised one heroine's affection to max level. (Mary Skelter 2)
Raised all heroines' affection to max level. (Mary Skelter 2)
Activated a Blood Soul Skill 30 times. (Mary Skelter 2)
Entered Blood Skelter mode for the first time. (Mary Skelter 2)