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 Baron Kane
Defeat General Gaius
Complete 10 Sidequests
Complete 20 Sidequests
Successfully complete a 1000+ hit combo
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
Bug Matti
Complete all Fale Quests
Complete the Game on Tough or Hardcore setting
Fulfill Bopo’s wish for snow
Destroy every enemy Cannon
Defeat Fuse
Defeat Lady Tethys
Complete 5 Sidequests
Successfully complete a 200+ hit combo
Kill 500 Enemies
Unlock a Treasure Chest
Unlock a Cage and Rescue a Friend
Use the DUST STORM on Fidget's Projectiles
Pick Up an Ability Orb
Level Up by Assigning Skill Gems
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
Kill an enemy with the slide attack
Meet Haley