The Darkness Cheat Mode

Cheat mode

Enter one of the following numbers at any phone to active the corresponding cheat function. If you entered the code correctly, you will hear a message.

2K Darkling

Enter "555-4263" as a number to unlock the 2K Darkling.

Golfer Darkling

Enter "555-5664" as a number to unlock the Golfer Darkling.

Secret phone numbers

The following is a list of all 35 secret phone numbers to enter at any phone. Entering these secret phone numbers will also accomplish the Keeper Of Secrets achievement.

555-6118
555-1847
555-6667
555-4569
555-9985
555-1037
555-1206
555-9528
555-3285
555-5723
555-8024
555-6322
555-9132
555-6893
555-2402
555-6557
555-2309
555-4372
555-9723
555-5289
555-6205
555-7658
555-1233
555-3947
555-9562
555-7934
555-7892
555-8930
555-3243
555-3840
555-2349
555-6325
555-4565
555-9898
555-7613
555-6969

Collectable phone numbers

Enter one of the following phone numbers at any phone to unlock a collectable:

555-4463
555-4525
555-4603
555-4649
555-4676
555-4682
555-4691
555-6418
555-6441
555-6454
555-6503
555-8164
555-6713
555-6799
555-6892
555-8416
555-8766
555-8856
555-8881
555-8896
555-8989
555-1093
555-1228
555-1229
555-1234
555-1266
555-3249
555-3318
555-1917
555-1952
555-3429
555-3440
555-3452
555-3492
555-3495
555-3496
555-3520
555-5197
555-3791
555-3794
555-5211
555-3849
555-5311
555-5327
555-5438
555-5439
555-5465
555-5466
555-5477
555-5549
555-5569
555-5595
555-5619
555-5709
555-7467
555-7526
555-7614
555-7641
555-7642
555-7643
555-7710
555-7761
555-9345
555-9588
555-9868
555-9903
555-9913
555-2575
555-2734
555-2763
555-2764
555-4336
555-2941

Answering machine phone numbers

The following is a list of answering machine phone numbers to enter at any phone:

555-7373: Butcher
555-2284: Jenny
555-7735: Paulie
555-4263: Retailer 1
555-5664: Retailer 2
555-6402: Sarah
555-8672: SBZ

Entire in-game movie

About three hours into the game, after you pass the cold storage part, you will end up in a hallway with a lot of doors you can open. The middle door will have some computers and an enemy that never heard the gunfight because he is watching a television with some headphones. Kill him and the television will be yours to use. The option to change the channel will be given to you. Change the channel and some music videos and cartoons will pass. Wait a few seconds to see what is coming on next. There will be one with some cheesy music and words, and white lines coming out. This is actually a movie from 1955 called The Man With The Golden Arm starring Frank Sinatra. You can watch the entire movie on this television.

Jenny in Chapter 4

When you are about to give up the Darkness guns and extract the Darkness, look at the Demon in the middle. Look behind him in the bright light and you should see Jenny.

Keeping the zombie soldiers dead

When you are in the "Otherworld" (you will go there after you die the first and second time), the Germans soldiers almost always get back up after you kill them. The only way to make sure they remain dead is to devour their hearts.

Defeating the Darkness in the castle

To defeat the Darkness in the castle (after you have blown open the gate), go up to every chair you see in the main room. Each chair will prompt you to activate it. Note: This does give away your Darkness powers for the time being. After the Darkness appears as a red/evil Jackie, put any guns away so that just your hands are out. This will stop his attacks. Then, walk up to him without any guns out, and a prompt should appear to "Accept Him". The fight will then be over.

Easy Bringing People Together achievement

Go to the last level at Paulie's mansion. Once you get to the point where you are inside the mansion, use your Black Holes repeatedly and hide in the darkness to regain your energy. You should get the achievement easily.

Easy Ghandi achievement

When you get to Dutch Oven Harry's place, talk to Roach. Do not shoot at him until he starts shooting.

Easy Romantic achievement

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.

Achievements

Accomplish the indicated achievement to get the corresponding number of Gamerscore points:

Hoodlum (5 points): Be on the winning side in a multiplayer match in any of the multiplayer modes.
Patriot (5 points): Capture a flag in a CTF match.
Murderer (5 points): Claim 20 Killing Streaks in multiplayer.
Hard to Kill (5 points): Take enough damage without dying within a multiplayer 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 multiplayer.
Mook (5 points): Be on the winning side in 5 multiplayer matches.
Henchman (15 points): Be on the winning side in 20 multiplayer matches.
Contract Killer (25 points): Be on the winning side in 50 multiplayer matches.
Made Man (35 points): Be on the winning side in 100 multiplayer matches.
The Don (45 points): Be on the winning side in 250 multiplayer 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 multiplayer 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:

Beginnings (25 points): Complete the first part of the game.
Into The Dark (50 points): Complete the second part of the game.
Crazy For You (25 points): Acquire Black Hole.
Hills (25 points): Acquire Darkness Guns.
No Man's Land (25 points): Acquire Demon Arm.
Happy Birthday (25 points): Acquire Creeping Dark.
Darkling Master (15 points): Acquire all Darkling types.
One With the Dark (25 points): Achieve maximum Darkness level.
Keeper Of Secrets (10 points): Call the secret phone numbers.

Source : Cheat Code Central