Hidden Deep achievements

Kill 1000 monsters

Ride a elevator from top to bottom non-stop. Yes, that's possible.

Complete a level with high enemy presence without dying (must be 50+ enemies)

Drill 100 meters of tunnel using the Tunnel Boring Machines

Kill 5 enemies in a row while hanging on the grappling hook

Kill 3 enemies using one Scan-Ball

Fall from 50 meters or more

Rappel down the full length of your grappling hook's line

Kill 20 enemies with your gun without dying

Let another team member use your rope to climb

Find a hidden cave using the Terra-Scanner

Kill 100 monsters