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.
Defeat General Gaius
Defeat Baron Kane
Successfully complete a 1000+ hit combo
Earn a Four-Star Rating in any Challenge Arena
Defeat Lady Tethys
Complete 5 Sidequests
Opt out of putting poison ivy into Gianni's laundry
Defeat Fuse
Successfully complete a 200+ hit combo
Craft an item from a blueprint
Meet Haley
Kill 500 Enemies
Unlock a Cage and Rescue a Friend
Unlock a Treasure Chest
Level Up by Assigning Skill Gems
Use the DUST STORM on Fidget's Projectiles
Pick Up an Ability Orb
Complete 10 Sidequests
Complete 20 Sidequests
Hang out with Twelve Friends in the Sanctuary
Earn a Four-Star Rating in EVERY Challenge Arena
Simultaneously Kill 6 Enemies with a Single Bomb
Reign chaos by putting poison ivy into Gianni's laundry
Successfully Parry with less than 10% health remaining
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
Destroy every enemy Cannon