Here is the full list of all 28 Along the Edge achievements.
Play it "hard to catch"
Be single at the end of the game
Finish the game with a majority of "Moon" and "Globe" choices
Choose not to call your therapist
Cut your hair short
Let Yves Malterre get into the tower
Finish the game with a majority of "Sun" and "Globe" choices
Spend the night with Stan
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
Chat with everyone at the cocktail
Have a conversation with your Grandmother
Spend the night with Frank
Listen to Frank'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
Finish the game by obliterating the Malterre family
Be romantically involved with Frank at the end of the game
Finish the game with a majority of "Sun" and "Star" choices
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
Sophie Delatour dies
Spend the night with Frank, then Stan
Listen to Stan's advice
Let Clothilde convince you to break up with Frank