Here is the full list of all 30 Dust: An Elysian Tail achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Level Up by Assigning Skill Gems
Successfully complete a 200+ hit combo
Use the DUST STORM on Fidget's Projectiles
Unlock a Treasure Chest
Defeat Fuse
Defeat Lady Tethys
Defeat Baron Kane
Defeat General Gaius
Complete 5 Sidequests
Complete 10 Sidequests
Complete 20 Sidequests
Successfully complete a 1000+ hit combo
Kill 500 Enemies
Unlock a Cage and Rescue a Friend
Hang out with Twelve Friends in the Sanctuary
Pick Up an Ability Orb
Earn a Four-Star Rating in any Challenge Arena
Earn a Four-Star Rating in EVERY Challenge Arena
Simultaneously Kill 6 Enemies with a Single Bomb
Opt out of putting poison ivy into Gianni's laundry
Reign chaos by putting poison ivy into Gianni's laundry
Successfully Parry with less than 10% health remaining
Craft an item from a blueprint
Bug Matti
Complete all Fale Quests
Complete the Game on Tough or Hardcore setting
Kill an enemy with the slide attack
Fulfill Bopo’s wish for snow
Meet Haley
Destroy every enemy Cannon