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.
Graduated and saved the day
Scanned every scannable type of object
Got out of the Gravelands
Found the garden
Defeated the Charger
Made one charge off a cliff
Cleared the Giant Gunk
Crafted five upgrades
Set up camp
Threw one on another
Scanned fifteen objects
Landed the Dust Bunny
Cleared the first gunk
Craft all upgrades
Sneak up and clog
Make one charge into another
Blast three to smithereens