Here is the full list of all 37 Midnight Castle Succubus DX achievements.
Defeat the Statue
Defeat Undine
Defeat Harpy
Defeat the Sphinx
Defeat the Dark Elven Queen
Defeat Dryad
Defeat the Queen of Masks
Defeat the prison mother
Defeat the Mermaid Queen
Defeat the Queen of Mud
Defeat the succubus
Defeat Succubus Second Form
Defeat the shadow of the succubus
Complete without rescue a single girl
Rescue the first girl
Rescue all girls
Complete without taking a crown
Take the first crown
Take all crowns
Clear without taking the red gem
Take the first red gem
Take all the red gems
Transform into a succubus
Use the Goddess of Revenge after clearing
Use another succubus hunter after clearing
Use another succubus after clearing
Join the warrior
Join the mage
Join the monk
Join the Thief
Complete without rescue a girl
Rescue and clear one or more girls
Rescue and clear all girls
Bad, good, best, see all three endings
Defeat the Queen of Flames
Defeat the Necromancer
Make map reach 100%