Here is the full list of all 36 Criminal Girls: Invite Only achievements.
Viewed Kisaragi's Individual ED.
Viewed Sako's Individual ED.
Viewed Ran's Individual ED.
Viewed Tomoe's Individual ED.
Viewed Shin's Individual ED.
Viewed Yuko's Individual ED.
You are Hell's champion.
Discovered the hidden ending.
You cleared the Garden of Memories.
Completed the game.
Completed Himekami's Wish.
Completed Miu's Wish.
Himekami turned into a Knight.
Miu turned into a Knight.
Cleared XF: Warden's Block.
Completed Ran's Wish.
Ran turned into a Knight.
Completed Kisaragi's Wish.
Kisaragi turned into a Knight.
Completed Sako's Wish.
Sako turned into a Knight.
Completed Shin's Wish.
Shin turned into a Knight.
Completed Tomoe's Wish.
Tomoe turned into a Knight.
Completed Yuko's Wish.
Yuko turned into a Knight.
Cleared Purgatory.
Viewed Alice's Individual ED.
Completed Alice's Wish.
Alice turned into a Knight.
Cleared the Education Block.
Cleared the Frost Block and brought everyone together!
Cleared the Inferno Block.
Cleared the Morass Block.
Cleared Prison Block.