Here is the full list of all 11 Fort Boyard achievements.
Drive 5km by car.
Complete all the challenges on hard mode.
Complete heroic adventure mode and collect at least 5,000 Boyards.
Collect more than 15,000 Boyards in the treasure room.
Complete all the challenges.
Complete adventure mode and collect at least 5,000 Boyards.
Complete adventure mode without failing a single challenge.