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