Codes that effect your name online (pre-patch) - Enter as your Clan Tag

Code Effect

RAIN Makes a rainbow scroll through your name.
.... Makes an "o" bounce from left to right in your Clan Tag.
MOVE Makes your name bounce from left to right.
cyln Red stripe goes back and forth through your letters
**** Same as .... code but a plus symbol goes back and forth in your tag.
Cycl Your name flashes different colors and directions

Unlockables

Modes

Complete certain objectives to unlock different game modes.

Veteran mode Reach Level 32 to unlock Veteran mode, which is a Co-op mode with much tougher enemies.
Zombie mode Successfully complete Campaign mode to unlock Zombie mode, which is a four-player Co-op mode against endless waves of Nazi zombies.

Multiplayer unlockables - Reach a certain rank on online multiplayer to achieve each unlockable.

Unlockables

.357 Magnum Level 49
1911 Colt Level 3
Arisaka Level 4
BAR Level 4
Browning M1919 Unlocked at level 61
Clan Tag Unlocked at level 11
Custom Class Slot 10 Reach Prestige Level Ten
Custom Class Slot 6 Reach Prestige Level One
Custom Class Slot 7 Reach Prestige Level Two
Custom Class Slot 8 Reach Prestige Level Four
Custom Class Slot 9 Reach Prestige Level Seven
Double-Barreled Shotgun Unlocked at level 29
DP-28 Unlocked at level 13
FG42 Unlocked at level 45
Flamethrower Reach level 65 in multiplayer
Gewehr 47 Level 6
Kar98k Unlocked at level 41.
M1 Garand Unlocked at level 17
M1A1 Carbine Unlocked at level 65
M2 Flamethrower Level 65
MG42 Unlocked at level 33
Molotov Cocktail Level 10
Mosin-Nagant Unlocked at level 21.
MP40 Unlocked at level 10
PPSh-41 Unlocked at level 53
PTRS-41 Unlocked at level 57
Springfield(sniper) Level 3
STG-44 Unlocked at level 37
Tokarev TT-33 Reach level 21
Trench Gun(shotgun) Level 2
Type 100 Unlocked at level 25
Walther Level 2

Trophies - List of unlockable trophies that you can obtain from Campaign Mode.

Unlockables

"When It Rains, It Pours" (Bronze) Complete 'Eviction' on Veteran difficulty. (Solo only)
Architect (Bronze) Complete 'Vendetta' on Veteran difficulty. (Solo only)
Bearing the Burden (Bronze) Complete 'Downfall' on Veteran difficulty. (Solo only)
Bloody Peleliu (Bronze) Complete 'Little Resistance' on Veteran difficulty. (Solo only)
Blowtorch and Corkscrew (Bronze) Complete 'Blowtorch and Corkscrew' on Veteran difficulty. (Solo only)
Blue Ribbon (Bronze) Complete a 4-player Competitive Co-Op match in 1st place. (Online co-op Only)
Carlson's Raiders (Silver) Complete 'Semper Fi' on any difficulty. (Solo only)
Close Shave (Bronze) Survive a banzai attack. (Solo only)
Fearless (Bronze) Complete 'Relentless' on Veteran difficulty. (Solo only)
Firestarter (Silver) Complete a level using only the flamethrower. Melee, grenades & explosives are OK.
For the Motherland (Bronze) Complete 'Heart of the Reich' on Veteran difficulty. (Solo only)
Get Your Hands Dirty (Bronze) Get Your Hands Dirty Complete 'Semper Fi' on Veteran difficulty. (Solo only)
Get Your Left Foot Wet (Bronze) Complete a match in Campaign Co-Op mode. (Online co-op only)
Get Your Right Foot Wet (Bronze) Complete a match in Competitive Co-Op mode. (Online co-op only)
Grave Robber (Silver) Collect all Death Cards in the game. (Solo only)
Guardian Angel (Bronze) In the final battle for Okinawa, save Sergeant Roebuck.
Gunslinger (Silver) Assassinate General Amsel with a pistol shot. (Solo only)
Hardened War Hero (Gold) Complete the game on Hardened or Veteran difficulty. (Solo only)
Hell on Wheels (Bronze) Complete 'Blood and Iron' on Veteran difficulty. (Solo only)
Iron Fist (Silver) Destroy all towers and bunkers in 'Blood and Iron'.
Kamikaze (Silver) Complete a level on Regular difficulty or higher using only melee or grenades. (Solo only)
Lights Out! (Bronze) In 'Black Cats', blast out all of the spot lights in the Japanese cargo convoy. (Solo only)
Mortar-dom (Bronze) Kill 8 Japanese with thrown mortars in 'Breaking Point.
No Return (Bronze) Complete 'Ring of Steel' on Veteran difficulty. (Solo only)
No Safe Place (Bronze) Burn an enemy out of a tree with the flamethrower in 'Hard Landing'.
One Bad Gato (Bronze) Complete 'Blackcats' on Veteran difficulty. (Solo only)
Platinum Trophy Awarded when all other trophies have been unlocked.
Purple Heart (Bronze) When staring into the face of adversity, show courage and persevere.
Rough Economy (Bronze) Kill 3 enemies with a single round.
Ruthless (Bronze) Kill 15 enemies while mounted on a tank in 'Ring of Steel'.
Saved Private Ryan (Bronze) Save the soldier before he burns to death.
Scorched Earth (Bronze) Complete 'Burn 'em Out' on Veteran difficulty. (Solo only)
Shot in the Dark (Bronze) Kill 10 enemies while the lights are out in the subway in 'Eviction'.
Snake in the Grass (Bronze) Take out a Japanese soldier lying in wait in the grass.
Stabbed in the Heart (Silver) Complete all missions on the Eastern Front on any difficulty. (Solo only)
Stormed Peleliu (Silver) Establish a beachhead at Peleliu Island on any difficulty. (Solo only)
Sum of All Zeros (Silver) Down 45 Japanese Zeros in 'Black Cats'. (Solo only)
The Hammer Strikes (Bronze) Complete 'Their Land, Their Blood' on Veteran difficulty. (Solo only)
The Last Stand (Silver) Survive the conflict in Okinawa on any difficulty. (Solo only)
The Professional (Silver) Shoot all of Amsel's henchmen, including their attack dog, without reloading. (Solo only)
The Sun Sets (Bronze) Complete 'Breaking Point' on Veteran difficulty. (Solo only)
The Sword Is Broken (Bronze) Complete 'Hard Landing' on Veteran difficulty. (Solo only)
Throw a Six and a Half (Silver) On Hardened or Veteran difficulty, complete a level without dying. (Solo only)
War Hero (Gold) Complete the game on any difficulty. (Solo only)
Weapon of Mass Destruction (Bronze) Radio in a naval bombardment that kills at least 4 Japanese soldiers.

Unlockable Perks - Perks that can be unlocked in the online multiplayer:

Bandolier Reach level 40
Bouncing Betty x 2 Reach level 24
Camouflage Reach level 12
Coaxial machine gun (vehicle) Reach level 40
Dead Silence Reach level 52
Double Tap Reach level 36
Fireproof Reach level 48
Iron Lungs Reach level 60
Juggernaut Reach level 4
Leadfoot (vehicle) Reach level 28
M2 Flamethrower Reach level 65
Martydom Reach level 20
Ordnance Training (vehicle) Reach level 12
Overkill Reach level 56
Primary Grenades x 2 Reach level 44
Reconnaissance Reach level 64
Second Chance Reach level 9
Shades Reach level 32
Sleight of Hand Reach level 28
Toss back Reach level 6