Discovered Skag Gully

Finish the game in Hard Mode

Shot and killed 3 Helghast using the Shotgun Pistol without reloading or switching weapons

Sneaked past all Helghast in the Jungle without alerting any of them

Travel 25 kilometers while riding the rails.

Made it to the Corinth River in Co-op mode

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

Vanquish Lord Vorselon.

Won a match in Operations, Warzone & Guerrilla Warfare modes

Captured a Tactical Spawn Area for the first time

Killed another player while cloaked

Repaired an object for the first time

Revived a friendly player for the first time