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