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