Here is the full list of all 37 Ori and the Will of the Wisps achievements worth 1,000 gamerscore.
Unlocked all Abilities
Found all Collectibles
Completed Hard Mode
Completed the Game
Maxed out Energy
Defeated Shriek
Unlocked all Shards
Completed all Wellspring Glades Projects
Completed every Side Quest
Defeated the Willow Stone
Bought all Maps from Lupo
Maxed out Life
Completed the Trade Sequence Quest
Escaped from the Ruins
Escaped the Avalanche
Completed all Spirit Trials
Completed all Spirit Shrines
Upgraded all Shard Slots
Fended off Kwolok
Defeated Kwolok in Under 2 Minutes
Fended off Mora
Defeated 5 Enemies Without Touching the Ground
Juggled 3 or More Projectiles in the Air for Over 5 Seconds
Cleared the Watermill
Reached the Wellspring Glades
Defeated the Horn Beetle
Defeated 10 Enemies using Environmental Hazards
Fended off Howl
Upgrade all Abilities
Upgrade all Shards
Defeat Mora Without Taking any Damage
Avoid Touching any Corrupted Water
Defeat 3 Enemies with a Single Spike
Beat the Game Without Equipping a Shard
Beat the Game Without Spending any Spirit Light
Complete the Game in Under 4 Hours
Complete the Game without Dying