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