Here is the full list of all 15 One Night on Halloween achievements.
You started your night on Halloween!
You got yourself a black eye!
You've got so much caffeine in you, you're jittery!
You took a nap. Get some Zzzz's.
You obtained alcohol! You should have a great party.
The party has started!!!
You've gotten Yosh's bad ending!
The cops showed up but it worked out in the end.
This time, it's bad.
You stumbled on the canon ending! Congrats!!!
You've gotten Yosh's good ending!
You've gotten Tooru's good ending!
You've gotten Akino's good ending!
You've gotten Tooru's bad ending!
You've gotten Akino's bad ending!