Here is the full list of all 19 Courage for a Kiss achievements.
Started the game
Sided with Evelyn
Sided with Jennifer
Well... You messed up
Finished Act One
There's nothing we could do about it
Anything that could go wrong, went wrong
A gun appeared on stage!
Finished Act Two
Started Evelyn's route
Started Stella's route
Started Amelia's route
Started Jennifer's route
Finished Evelyn's route
Finished Stella's route
Finished Amelia's route
Finished Jennifer's route
Finished the game for the first time!
Finished all four routes!