Here is the full list of all 28 Along the Edge achievements.
Have a conversation with your Grandmother
Play it "hard to catch"
Have a mystical encounter in the forest
Witness the fire at the Castle
Finish the game by obliterating the Malterre family
Be single 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 romantically involved with Frank at the end of the game
Be romantically involved with Stanislas at the end of the game
Accept Clothilde's deal while being in a relationship with Stanislas
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
Let Yves Malterre get into the tower
Sophie Delatour dies
Spend the night with Frank
Spend the night with Stan
Spend the night with Frank, then Stan
Chat with everyone at the cocktail
Cut your hair short
Listen to Frank's advice
Listen to Stan's advice
Be friends with Solène at the end of the game
Choose not to call your therapist
Let Clothilde convince you to break up with Frank