Here is the full list of all 20 Ameline and the Ultimate Burger achievements.
Get at least 5000 coins
Clear all missions
Buy all hats
Buy all projectiles
Clear all missions without losing a burger
Clear all missions without dying
Clear all missions without getting hit
Get Rank S on all missions
Clear all missions with Ameline
Clear all missions with Delphine
Clear all missions with Lief
Clear all missions with Tybalt
Defeat 2000 rats
Defeat 1000 bunnies
Defeat 1500 fishes
Collect 1000 cheeses
Use 10 power potions
Use 10 speed potions
Use 300 Super Attacks
Destroy 300 crates