Here is the full list of all 33 Snake Pass achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Collected All Of Air's Wisps
Collected All Of The Gatekeeper Coins
You Can't Get Better Than 100%
Collected All Of Fire's Wisps
Collected All Of Water's Wisps
Completed Every Level Without Dying
Disturbed A Gatekeeper Idol In Every Level
Used Hummingbird Take-Off Points 50 Times
Collected 50% Of The Collectibles
Completed Lazy Lagoon Without Touching The Water
Collected Two Keystones In Gatekeeper Gardens Without Touching The Floor
Used Hummingbird's Tail Lift Continuously In Paradise Path
Got A Hole In One On Crooked Canal
Used Snake Vision
Received A Gift From Bloh-Wee, Air Gatekeeper
Death Comes In Many Forms
Death Has No Meaning To You
Used Each Of Noodle's Skills
Received A Gift From Cyn-Derr, Fire Gatekeeper
Used Every Type Of Switch
Used Hummingbird's Tail Lift 100 Times
Collected And Placed Keystones On The Gate One At A Time
Received A Gift From Sog-Gee, Water Gatekeeper
Pulled Every Kind Of Face
Fell From A Great Height
Activated A Gate Without Activating Any Checkpoints
Received A Gift From Bol-Dor, Earth Gatekeeper
Collected All Of Earth's Wisps
Collected 20% Of The Collectibles
Placed Three Keystones Into The Gate
Fixed The First Gate
Maintained Top Slither Speed For 10 Seconds
Fell To Your Death Near A Danger Sign