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