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