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