Here is the full list of all 28 Along the Edge achievements.
Chat with everyone at the cocktail
Choose not to call your therapist
Have a conversation with your Grandmother
Spend the night with Frank, then Stan
Spend the night with Frank
Spend the night with Stan
Listen to Stan's advice
Be friends with Solène at the end of the game
Have a mystical encounter in the forest
Witness the fire at the Castle
Accept Clothilde's deal while being in a relationship with Stanislas
Be romantically involved with Stanislas at the end of the game
Finish the game with a majority of "Moon" and "Star" choices
Finish the game with a majority of "Sun" and "Star" choices
Finish the game with a majority of "Sun" and "Globe" choices
Finish the game with a majority of "Moon" and "Globe" choices
Be single at the end of the game
Be romantically involved with Frank at the end of the game
Accept Clothilde's deal without being in a relationship with Stanislas
Help Yves Malterre break the curse
Yves Malterre sacrifices himself to break the curse
Finish the game by obliterating the Malterre family
Let Yves Malterre get into the tower
Sophie Delatour dies
Play it "hard to catch"
Cut your hair short
Listen to Frank's advice
Let Clothilde convince you to break up with Frank