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