Armed and Gelatinous: Couch Edition

To get this and the other related achievements, set up your options as follows.

Team Deathmatch
5 kills
Copious
Default

Gnarly Gnebula

Derelict Dumpster
Dumpy Depot
Grungy Gear
Bomb Barrage

Play the above 4 levels, and once completed, you will unlock the achievement once you return to Match Settings or Main Menu