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