Here is the full list of all 57 Ori and the Blind Forest: Definitive Edition achievements worth 1,250 gamerscore.
Completed the game
Reunited with Naru
Completed the game on Hard Difficulty
Restored the Element of Warmth
Saved at every Spirit Portal
Killed 50 enemies with Stomp
Entered Mt. Horu
Obtained the Sunstone
Earned all Efficiency Skills in the Ability Tree
Escaped Kuro
Restored the winds of Nibel
Cleared the Misty Woods
Found 50% of all secrets
Found the lost corridor in the Misty Woods
Uncovered the mysteries of Naru
Activated 3 torches using Light Burst
Collected 200 Energy Shards
Killed 25 enemies using Bash to reflect projectiles
Tricked 5 enemies into killing another enemy
Escaped the rising waters of the Ginso Tree
Restored the heart of the Ginso Tree
Double Jumped 5 times consecutively without touching the ground
Entered the Ginso Tree
Rescued Gumo
Restored 50% of all Map Stones
Created 50 Soul Links
Killed 500 enemies with Spirit Flame
Discovered Gumo
Escaped the Boulder in Black Root Burrows
Caused an enemy to destroy itself
Opened 5 shortcuts using the Charge Flame
Killed 4 enemies simultaneously using Charge Flame.
Met the Spirit Tree
Restored your first Map Stone
Used your first ability point
Found your first secret
Completed the Prologue
Kill 5 enemies with Charge Jump
Find all secrets
Restore all Map Stones
Visit 100% of the map
Earn all Utility Skills in the Ability Tree
Earn all Combat Skills in the Ability Tree
Earn all skills in the Ability Tree
Collect all Energy Cells
Collect all Health Cells
Juggle a rock 5 times without it hitting the ground
Bash off enemies 10 times in a row without touching the ground
Kill 3 enemies without touching the ground
Crush a Ram with a Stomper
Kill 100 enemies with Charge Flame
Finish the game in under 3 hours
Complete whole game without dying
Complete the whole game without using an Ability Point
Kill 5 enemies using Charge Dash
Kill 50 enemies with Light Burst
Complete the game on One Life Difficulty