Here is the full list of all 24 Sweet Dream Succubus - there are Nightmare Edition achievements.
Get all 3 endings.
Get killed by the succubus.
Get a girlfriend
Get looped by a movie.
Solve her identity, her kind and her goal.
Beat the game in 3 loops
Get the succubus master ending.
Get to credits screen.
Discover her full name
Get all events
Getting the church event
Making the shady guy talk.
Discover her second name
Getting the Jog event.
Skip a shower.
Starting a game loop.
Getting the movie event.
Getting the library event.
Wear a condom!
Get the clinic event.
Discover her first name.
Getting the hotel event
Getting the delivery event.
Starting a new game for the first time.