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 12 levels without using undo
Discover the hidden treasure
Collect ALL the coins
Complete Winterfest
Find the sneaky coin in level 17
Complete any Winterfest island without using undo
Break 7 pots in 3 seconds
Enter the hidden chamber
Find the Lantri!
Smash a distant pot in level 9
Ride 30 elevators
Get an explorer to say "Woo!"
Get unstuck after being stuck
Undo 12 times in a row
Get onto a spinning platform that you control
Boost down on an explorer
Boost up on an explorer