Here is the full list of all 31 Dust: An Elysian Tail trophies - there are 16 bronze, 8 silver, 6 gold and 1 platinum.
Defeat General Gaius
Defeated Baron Kane
Complete all Fale Quests
Completed 10 Sidequests
Successfully complete a 1000+ hit combo
Completed 5 Sidequests
Reign chaos by putting poison ivy into Gianni's laundry
Craft an item from a blueprint
Meet Haley
Kill an enemy with the slide attack
Defeated Lady Tethys
Defeated Fuse
Simultaneously Kill 6 Enemies with a Single Bomb
Unlock a Cage and Rescue a Friend
Kill 500 Enemies
Successfully complete a 200+ hit combo
Unlock a Treasure Chest
Level Up by Assigning Skill Gems
Use the DUST STORM on Fidget's Projectiles
Pick Up an Ability Orb
Unlock all other Trophies
Completed 20 Sidequests
Hang out with Twelve Friends in the Sanctuary
Earn a Four-Star Rating in any Challenge Arena
Earn a Four-Star Rating in EVERY Challenge Arena
Opt out of putting poison ivy into Gianni's laundry
Successfully Parry with less than 10% health remaining
Bug Matti
Complete the Game on Tough or Hardcore setting
Fulfill Bopo's wish for snow
Destroy every enemy Cannon