Here is the full list of all 25 The Quest For Excalibur - there are Puy Du Fou achievements.
Run 3 km in the park
Complete all the “Signe du Triomphe” trials
Complete all the Viking trials
Complete all the “Secret de la Lance” trials
Bring back all of La Pérouse’s notebooks
Restore Clovis' Treasure
Complete all of La Fontaine's challenges
Collect all the Excalibur Shards
Free Arthur from his prison
Complete the “Drakkars Race” trial, in hard mode, without making a mistake once
Complete the “Axe Throwing” trial while getting all the axes on the target
Complete the “Vikings Battle” trial in less than 180 seconds
Complete the “Archery” trial without wasting any arrows
Complete the “High-Speed Chase” trial in less than 40 seconds
Complete the “Chariots Race” trial while finishing first at the end of each lap
Defeat the Stadium champion while losing no more than 20% of your health in “Gladiators Fight”
Win the “Javelin Throwing” trial with an average throw greater than 140m on Hard
Win the “Imperial Naumachia” trial without the galley’s life bar dropping under half
Complete the “Musical Challenge” trial without missing a single note (on hard mode)
Complete the “Equestrian Vaulting” trial, in hard mode, without missing any double inputs
Complete the “Knight Training” trial without missing a single sequence
Complete the “Jousting” trial by hitting all the targets
Complete the “Defending the Ramparts” trial after having knocked out at least 3 ladder carriers
Complete the “Crossbow Shooting” trial in less than 60 seconds in hard mode
Win the “Saving Arthur” trial by knocking out Morgana in less than 90 seconds