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