The Darkness Cheats - Xbox 360

Unlock Special Darklings
At any in-game phone enter the number and you will unlock a special Darkling:

555-GAME - Unlocks Special 2K Darkling
555-5664 - Unlocks the European Retailer (Golfer) Special Darkling

More Phone Numbers
Go to any phone and enter these numbers, in no specific order, to unlock Keeper of Secrets accomplishment. These can be found throughout the game on posters, graffiti, and pretty much anything else. Out of the 25, you only have to enter 18 to unlock the accomplishment, after that the rest are useless.

555-6118
555-9723
555-1847
555-5289
555-6667
555-6205
555-4569
555-7658
555-9985
555-1233
555-1037
555-3947
555-1206
555-9562
555-9528
555-7934
555-3285
555-7892

Achievements
Complete each achievement to get the allotted gamerscore:

Anti Air (15) - Bring down the Chopper
Anti Hero (25) - Complete game on normal setting
Bringing People Together (5) - Trap 5 enemies within a Black Hole
Bullet Dodger (20) - Finish a multiplayer match with less than 5 deaths (minimum of 4 players)
Butcher (25) - Claim 20 Killing Streaks in multiplayer
Cannibal (25) - Devour 300 enemies
Completionist (20) - Unlock 100 collectables
Contract Killer (25) - Be on the winning side in 50 multiplayer matches
Darkness Master (100) - Only for those who are completely in tune with the Darkness
Executioner (10) - Kill 25 enemies using execution moves
Fashionable (25) - Collect all the Darkling outfits
Flag Owner (10) - Capture 50 flags in a CTF match
Flag Runner (5) - Capture 20 flags in a CTF match
Gatherer (5) - Unlock 25 collectables
Ghandi (10) - Find a peaceful solution. At least momentarily
Gunner (15) - Kill 30 enemies using Darkness Guns
Gunslinger (25) - Kill 7 enemies within 15 seconds
Hard to Kill (5) - Take enough damage without dying within a multiplayer match
Heart of Gold (50) - Help those in need
Henchman (15) - Be on the winning side in 20 multiplayer matches
Hoodlum (5) - Be on the winning side in a multiplayer match in any of the multiplayer modes
Knuckle, Meet Face (5) - Perform a melee kill for the first time
Legendary Dark (35) - Complete game on hard setting
Legendary Executioner (20) - Kill 50 enemies using execution moves
Legendary Summoner (25) - Summon 50 Darklings
Made Man (35) - Be on the winning side in 100 multiplayer matches
Mook (5) - Be on the winning side in 5 multiplayer matches
Murderer (5) - Claim 20 Killing Streaks in multiplayer
Patriot (5) - Capture a flag in a CTF match
Picking Up Stuff (5) - Unlock a collectable for the first time
Ripper (15) - Kill 30 enemies using Demon Arm
Roadkill (10) - Kill the workers in the tunnel
Rogue Killer (15) - Kill 15 enemies using Creeping Dark
Romantic (10) - Real guys stick around for their ladies
Summoner (5) - Summon 5 Darklings
Take a Look at the Sky (50) - Take down 6 airplanes
The Collector (10) - Unlock 50 collectables
The Don (45) - Be on the winning side in 250 multiplayer matches
The Obsessive Collector (15) - Unlock 75 collectables
Up Close and Personal (5) - Perform an execution move for the first time
Void Bringer (15) - Kill 20 enemies using Black Hole

Collectables
Simply enter the phone number at any payphone from within the game to unlock a collectable and remember there are acheivment points for collecting 1, 25, 50, and 100 collectables. Thats 4 EASY acheivments totalling 40 points, not to mention the hours of searching to find the numbers in game:

Collectable 01 - 555-1037
Collectable 02 - 555-1847
Collectable 03 - 555-1206
Collectable 04 - 555-1233
Collectable 05 - 555-2309
Collectable 06 - 555-2349
Collectable 07 - 555-2402
Collectable 08 - 555-3243
Collectable 09 - 555-3285
Collectable 10 - 555-3840
Collectable 11 - 555-3947
Collectable 12 - 555-4372
Collectable 13 - 555-4463
Collectable 14 - 555-4525
Collectable 15 - 555-4565
Collectable 16 - 555-4569
Collectable 17 - 555-4603
Collectable 18 - 555-4649
Collectable 19 - 555-4676
Collectable 20 - 555-4682
Collectable 21 - 555-4691
Collectable 22 - 555-5289
Collectable 23 - 555-5723
Collectable 24 - 555-6118
Collectable 25 - 555-6205
Collectable 26 - 555-6322
Collectable 27 - 555-6325
Collectable 28 - 555-6557
Collectable 29 - 555-6667
Collectable 30 - 555-6893
Collectable 31 - 555-6969
Collectable 32 - 555-7613
Collectable 33 - 555-7658
Collectable 34 - 555-7892
Collectable 35 - 555-7934
Collectable 36 - 555-8024
Collectable 37 - 555-8930
Collectable 38 - 555-9132
Collectable 39 - 555-9528
Collectable 40 - 555-9562
Collectable 41 - 555-9723
Collectable 42 - 555-9898
Collectable 43 - 555-9985