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