Here is the full list of all 17 The Gunk achievements worth 1,000 gamerscore. It takes around 6-8 hours to unlock all of the achievements on Xbox One.
Crafted all upgrades
Graduated and saved the day
Scanned every scannable type of object
Blasted three to smithereens
Got out of the Gravelands
Made one charge into another
Found the garden
Defeated the Charger
Clogged an unaware turret
Crafted five upgrades
Made one charge off a cliff
Cleared the Giant Gunk
Threw one on another
Set up camp
Scanned fifteen objects
Landed the Dust Bunny
Cleared the first gunk