Defeat 20 enemies with headshots

Destroyed Stahl's Cruiser and left the planet on any difficulty

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Killed 50 Helghast using Brutal Melee

Killed 500 Helghast

Defeated the ATAC outside the Stahl Arms facility

Defeat 10 enemies in a row, alternating gunplay and hand-to-hand

Stealth take-down 5 enemies

Got off the 2nd Rig within 2 minutes.

Killed 25 Helghast using Brutal Melee

Successfully assisted with defeating the Arc APCs

Shot and killed 6 Helghast using the Sniper Rifle without reloading or switching weapons

Reached the Corinth River with the convoy