Complete the following achievements to unlock Xbox Live Gamerscore points.
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Hoodlum (5 points): Be on the winning side in a multi-player match in any of the multi-player modes. 

Patriot (5 points): Capture a flag in a CTF match. 

Murderer (5 points): Claim 20 Killing Streaks in multi-player. 

Hard to Kill (5 points): Take enough damage without dying within a multi-player match. 

Flag Runner (5 points): Capture 20 flags in a CTF match. 

Flag Owner (10 points): Capture 50 flags in a CTF match. 

Butcher (25 points): Claim 20 Killing Streaks in multi-player. 

Mook (5 points): Be on the winning side in 5 multi-player matches. 

Henchman (15 points): Be on the winning side in 20 multi-player matches. 

Contract Killer (25 points): Be on the winning side in 50 multi-player matches. 

Made Man (35 points): Be on the winning side in 100 multi-player matches. 

The Don (45 points): Be on the winning side in 250 multi-player matches. 

Anti Hero (25 points): Complete game on normal setting. 

Legendary Dark (35 points): Complete game on hard setting. 

Cannibal (25 points): Devour 300 enemies. 

Fashionable (25 points): Collect all the Darkling outfits. 

Bringing People Together (5 points): Trap 5 enemies within a Black Hole. 

Rogue Killer (15 points): Kill 15 enemies using Creeping Dark. 

Void Bringer (15 points): Kill 20 enemies using Black Hole. 

Gunner (15 points): Kill 30 enemies using Darkness Guns. 

Ripper (15 points): Kill 30 enemies using Demon Arm. 

Summoner (5 points): Summon 5 Darklings. 

Legendary Summoner (25 points): Summon 50 Darklings. 

Darkness Master (100 points): Only for those who are completely in tune with the Darkness. 

Roadkill (10 points): Kill the workers in the tunnel. 

Ghandi (10 points): Find a peaceful solution. At least momentarily. 

Romantic (10 points): Get a kiss from Jenny during the movie. 

Heart of Gold (50 points): Help those in need. 

Gunslinger (25 points): Kill 7 enemies within 15 seconds. 

Anti Air (15 points): Bring down the Chopper. 

Take a Look at the Sky (50 points): Take down 6 airplanes. 

Knuckle, Meet Face (5 points): Perform a melee kill for the first time. 

Up Close and Personal (5 points): Perform an execution move for the first time. 

Executioner (10 points): Kill 25 enemies using execution moves. 

Picking Up Stuff (5 points): Unlock a collectable for the first time. 

Gatherer (5 points): Unlock 25 collectables. 

The Collector (10 points): Unlock 50 collectables. 

The Obsessive Collector (15 points): Unlock 75 collectable. 

Completionist (20 points): Unlock 100 collectables. 

Bullet Dodger (20 points): Finish a multi-player match with less than 5 deaths 
(minimum of 4 players). 

Legendary Executioner (20 points): Kill 50 enemies using execution moves. 

Additionally there are nine secret achievements, all of which are currently unknown.