Here is the full list of all 27 One Night Stand achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
You investigated every item in the game.
You receive another message from Gary.
You told her the last name that she wanted to hear.
What’s in a name anyway?
Honesty really is the best policy.
Turns out you share the same name!
You chose not to believe anything.
You might want to double check the evidence...
You made a break for it.
You got thrown out with your clothes on.
Accuse her of drugging you.
You both felt the same way about the book, her writing and Love IRL.
Escaped during her moment of need.
You choose to remain silent whenever possible.
She picked up her six-string.
You got caught wearing her underwear.
That's why they call it a one night stand.
Order a fancy coffee.
You became friends.
Sharing isn't caring.
You became a fan of Love IRL.
You got thrown out.
You got thrown out without your clothes.
Escaped quickly and clothed.
You failed at the last hurdle.
You successfully stole a pair of her panties.
You got rejected.