The Darkness - Platform: Xbox 360

Play as Darkling:
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To unlock a secret Darkling go to any pay phone in the subway and dial 555-4263 (555-GAME). 
You will hear a message to confirm correct code entry.

Collectable 1:
Go to any pay phone and dial 555-4463. You will hear a message to confirm correct code entry.

Collectable 2:
Go to any pay phone and dial 555-4525. You will hear a message to confirm correct code entry.

Collectable 3:
Go to any pay phone and dial 555-4565. You will hear a message to confirm correct code entry.

Collectable 4:
Go to any pay phone and dial 555-4569. You will hear a message to confirm correct code entry.

Collectable 5:
Go to any pay phone and dial 555-4603. You will hear a message to confirm correct code entry.

Collectable 6:
Go to any pay phone and dial 555-4649. You will hear a message to confirm correct code entry.

Collectable 7:
Go to any pay phone and dial 555-4676. You will hear a message to confirm correct code entry.

Collectable 8:
Go to any pay phone and dial 555-4682. You will hear a message to confirm correct code entry.

Collectable 9:
Go to any pay phone and dial 555-4691. You will hear a message to confirm correct code entry.

Collectable 10:
Go to any pay phone and dial 555-6118. You will hear a message to confirm correct code entry.

Achievements:
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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.

Easy "Romantic" achievement:
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Simply wait until you kiss Jenny during the movie, then look over at her to get the 
"Get up and leave" option. You do not have to watch the entire movie.