Here is the full list of all 10 DreamWorks Dragons Dawn of New Riders achievements.
Open 100 Chests
Acquire Patch's Fire Ability
Discover Every Side Island
Take to the Skies on Patch for the First Time
Acquire Patch's Electrical Ability
Meet Patch for the First Time
Rescue Every Captive Air Strike Dragon
Upgrade Every Weapon to its Maximum Level
Craft Every Item in Gobber's Store
Complete the Game