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