Full list of all 23 Going Under achievements worth 1,050 gamerscore. It takes around 12-15 hours to unlock all of the achievements in the base game on Xbox One.
The base game contains 20 achievements worth 1,000 Gamerscore, and there is 1 DLC pack containing 3 achievements worth 50 Gamerscore.
Meet Your Coworkers.
Obtain The Mana Press.
Obtain The Toxic Mask.
Obtain The Grim Ledger.
Go Under.
Obtain The Caffiend's Share.
Obtain Hover Hands' Share.
Obtain Hustlebones' Share.
Defeat Vested Marv.
Save the World?
Unlock all skills.
Complete Ray's mentorship.
Complete Swomp's mentorship.
Complete Tappi's mentorship.
Complete Kara's mentorship.
Complete Fern's mentorship.
Open 100 delivery cubes.
Kill a Hungry Box.
Get cursed 13 times.
Kill a power loader with Exit Strategist.
Win a run in Impostor Mode.
Complete The Impostor's final test.
Complete the Rolodex