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