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