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