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