Complete the following tasks to unlock the corresponding achievement. To view your achievements and stats in Steam, select "Community", then "My profile", then "View all my games", then the game and view stats.
Avalanche!: Survive Momma Yeti's cave-in.
Chihoohoo's Test: Prove your worth to Chihoohoo in a rumble with his guards.
City Enforcer: Force your way through Warmachine to get into Bad City.
Dr. Maybee's Ultimatum: Make the tough choice when confronted by Dr. Maybee.
Dreamer: Complete a Dojo training session.
Heart of Gold: Collect a full heart container.
Hoarder: Purchase all the shop items.
Luminescent Danger: Triumph over the dangers deep beneath the sea.
Novice Collector: Purchase a store item.
Unleash the Guru: Start a Co-op game.
Up Up and Away: Catch an Umbrella Seed to the Old Man Mountains.
Winning: Achieve a perfect status on every level.