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