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.
Opt out of putting poison ivy into Gianni's laundry
Defeat General Gaius
Complete the Game on Tough or Hardcore setting
Simultaneously Kill 6 Enemies with a Single Bomb
Hang out with Twelve Friends in the Sanctuary
Bug Matti
Earn a Four-Star Rating in EVERY Challenge Arena
Destroy every enemy Cannon
Fulfill Bopo’s wish for snow
Complete 20 Sidequests
Defeat Baron Kane
Successfully complete a 1000+ hit combo
Defeat Lady Tethys
Complete 10 Sidequests
Complete all Fale Quests
Kill an enemy with the slide attack
Complete 5 Sidequests
Defeat Fuse
Earn a Four-Star Rating in any Challenge Arena
Reign chaos by putting poison ivy into Gianni's laundry
Kill 500 Enemies
Successfully Parry with less than 10% health remaining
Craft an item from a blueprint
Meet Haley
Successfully complete a 200+ hit combo
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