Defeat 75 enemies in a row without dying

Defeat 50 enemies with hand-to-hand combat

Defeat 20 enemies with hand-to-hand combat

Complete The Cruiser on any difficulty level

Electrocute 3 Helghast with a single burst from the VC5 Electricity Gun

Kill the Tharsis Refinery ArcTrooper in under 1 minute 30 seconds

You completed the mission "Roman's Sorrow".

Complete Mission on any difficulty: Discovery

Complete Mission on any difficulty: Sanctuary

Shoot off 100 Helghast helmets during battle

Manually reload your weapon 150 times

Kill 30 Helghast using the StA3 fixed gun emplacement

Kill the Blood Meridian heavy in under 1 minute