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