M.A.R.S. achievements

Kill 5000 Zombie Enemies

Complete a mission in nightmare difficulty

Equip a Calling Card

Complete the map Big Dam Heroes on the Nightmare difficulty

Kill 500 Enemies with Grenades

Complete the Mercy Killing Map in Kill Every Thing 2.0 Mode on Nightmare Difficulty

In Multiplayer, save a total of 50 teammates from death

Reach Level 15

Kill 5000 Mechanical Enemies

Complete the Mercy Killing Map in Kill Every Thing 2.0 Mode on Normal Difficulty

Complete the Mercy Killing Map in Kill Every Thing 2.0 Mode on Hard Difficulty

Kill 5000 Brute Enemies