Here is the full list of all 17 Path of Giants achievements. It takes around 4-5 hours to unlock all of the achievements on Windows.
Complete Winterfest
Collect ALL the coins
Find the sneaky coin in level 17
Complete any Winterfest island without using undo
Get unstuck after being stuck
Undo 12 times in a row
Break 7 pots in 3 seconds
Discover the hidden treasure
Complete 12 levels without using undo
Enter the hidden chamber
Smash a distant pot in level 9
Find the Lantri!
Ride 30 elevators
Get an explorer to say "Woo!"
Get onto a spinning platform that you control
Boost down on an explorer
Boost up on an explorer