Here is the full list of all 38 Dead Ground achievements.
Fully upgrade the mammoth tower
Kill 10 bosses
Survive day 6
Fully upgrade the commando tower
Unlock Quadrat
Survive day 4
Survive day 2
Unlock "Sword Of Fear" Artifact
Unlock "Shard Of Life" Artifact
Survive day 8
Survive day 10
Beat the final boss
Collect 100,000 scrap in total
Collect 10,000 water in total
Kill 10,000 enemies
Kill 50,000 enemies
Kill 100,000 enemies
Kill 50 bosses
Kill 100 boses
Kill every unique boss at least once
Unlock King
Unlock Gogo
Unlock "The Death" Artifact
Unlock "The Secret" Artifact
Unlock "Mask Of Terror" Artifact
Unlock "Tormented Soul" Artifact
Unlock "The Desire" Artifact
Unlock "Orb Of Luck" Artifact
Unlock every character and artifact
Beat the game with the death artifact on
Fully upgrade the sniper tower
Fully upgrade the gatling tower
Fully upgrade the hell bringer tower
Fully upgrade the cryoblaster tower
Fully upgrade the H.S.M. tower
Fully upgrade the mini nuke tower
Sell 500 items
Buy 500 items