Call of Duty: World at War Cheats

Grave Robber (15 points): Collect all Death Cards in the game. (Solo only).
Guardian Angel (10 points): In the final battle for Okinawa, save Sergeant Roebuck. (Solo or co-op).
Gunslinger (15 points): Assassinate General Amsel with a pistol shot. (Solo only).
Hardened War Hero (100 points): Complete the game on Hardened or Veteran difficulty. (Solo only).
Hell on Wheels (30 points): Complete 'Blood and Iron' on Veteran difficulty. (Solo only).
Iron Fist (15 points): Destroy all towers and bunkers in 'Blood and Iron'. (Solo or co-op).
Kamikaze (15 points): Complete any level on Regular difficulty or higher using only melee and grenades. (Solo only).
Lights Out! (10 points): In 'Black Cats', blast out all of the spot lights in the Japanese cargo convoy. (Solo only).
Mortar-dom (10 points): Kill 8 Japanese with thrown mortars in 'Breaking Point'. (Solo or co-op).
No Return (30 points): Complete 'Ring of Steel' on Veteran difficulty. (Solo only).
No Safe Place (15 points): Burn an enemy out of a tree with the flamethrower in 'Hard Landing' (Solo or co-op).
One Bad Gato (30 points): Complete 'Black Cats' on Veteran difficulty. (Solo only).
Rough Economy (15 points): Kill 3 enemies with a single bullet. (Solo or co-op).
Ruthless (15 points): Kill 15 enemies while mounted on a tank in 'Ring of Steel'. (Solo or co-op).
Saved Private Ryan (10 points): Save the soldier before he burns to death. (Solo or co-op).
Scorched Earth (30 points): Complete 'Burn'em Out' on Veteran difficulty. (Solo only).
Setting of the Sun (30 points): Complete 'Breaking Point' on Veteran difficulty. (Solo only).
Shot in the Dark (10 points): Kill 10 enemies while the lights are out in the subway in 'Eviction'. (Solo or co-op).
Snake in the Grass (15 points): Take out a Japanese soldier while he is lying in wait in the grass. (Solo or co-op).
Stabbed in the Heart (20 points): Complete all missions on the Eastern Front on any difficulty setting. (Solo only).
Stormed Peleliu (15 points): Establish a beachhead on the island of Peleliu on any difficulty. (Solo only).
The Hammer Strikes (30 points): Complete 'Their Land, Their Blood' on Veteran difficulty. (Solo only).
The Last Stand (20 points): Survive the land and air conflict surrounding Okinawa on any difficulty. (Solo only).
The Professional (15 points): Shoot all of Amsel's henchmen, including their attack dog, without reloading. (Solo only).
The Sum of All Zeros (15 points): Down 45 Japanese Zeros in 'Black Cats'. (Solo only).
The Sword Is Broken (30 points): Complete 'Hard Landing' on Veteran difficulty. (Solo only).
Throw a Six and a Half (15 points): On Hardened or Veteran difficulty, complete a level without dying. (Solo only).
War Hero (40 points): Complete the game on any difficulty. (Solo only).
Weapon of Mass Destruction (15 points): Radio in a naval bombardment that kills at least 4 Japanese soldiers. (Solo or co-op).
When It Rains, It Pours (30 points): Complete 'Eviction' on Veteran difficulty. (Solo only).

Map Pack 2 Zombie Mode Achievements
Complete each achievement to get the allotted gamerscore. Can only be achieved in Map Pack 2.

Big Baller (30): Earn 75,000 points in a single Nazi Zombie game. (Map Pack 2 only)
Big Brawler (30): Get 10 consecutive zombie melee kills before Insta-Kill expires. (Map Pack 2 only)
Deadhead (30): Get 150 zombie headshots in a single game. (Map Pack 2 only)
Fertilizer Man (30): Kill 200 zombies in a single game. (Map Pack 2 only)
Hammer Time (10): Repair 200 window boards in a single game. (Map Pack 2 only)
It's a Trap! (20): Kill at least one zombie with three different traps in a single round. (Map Pack 2 only)
Perk-a-Holic (20): Have all four perks simultaneously active in a game of Nazi Zombies. (Map Pack 2 only)
Soul Survivor (50): Reach round 15 in Nazi Zombies without getting revived. (Map Pack 2 only)
Weapon of Minor Destruction (20): Kill no more than one zombie with a nuke. (Map Pack 2 only)

Map Pack 3 Achievements
Achievements from Map Pack 3 zombie map "Der Riese". Complete the achievement to get the alotted gamerscore. Can Only be completed in the map "Der Riese"

40 Knives! (25): Kill 40 zombies with the bowie knife.
Acquire Waffle Weapons! (25): Obtain the Ray Gun, DG-2, and Monkey Bomb at the same time.
Der Electrician!: Link all teleport pads before round 7.
Evaluate your senses! (25): Activate the fly trap.
Frequent Flyer! (25): Use the teleporter 8 times.
Locksmith! (25): Open all doors in the map
Pack Addict! (25): Upgrade 5 weapons at the Pack a Punch Machine.
Perkaholics Anonymous! (25): Survive until round 20 without buying a single Perk.
The Might of the Monkey! (25): Use the Monkey Bomb.
Wacker Packer! (25): Upgrade any weapon in Pack A Punch.

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:

.357 Magnum: Reach level 49
Arisaka: Reach level 4
BAR: Reach level 4
Browning M1919: Reach level 61
Clan Tag: Reach level 11
Colt M1911: Reach level 3
Custom Class Slot 10: Reach Prestige Level 10
Custom Class Slot 6: Reach Prestige Level 1
Custom Class Slot 7: Reach Prestige Level 2
Custom Class Slot 8: Reach Prestige Level 4
Custom Class Slot 9: Reach Prestige Level 7
Double-Barreled Shotgun: Reach level 29

Multiplayer Perk Unlockables
Reach a certain level online:

Bandolier: Reach level 40
Bomb Squad: Reach rank 16
Bouncing Betty x 2: Reach level 24
Camouflage: Reach level 12
Coaxial Machine Gun(vehicle): Reach level 40
Dead Silence: Reach level 52
Deep Impact: Reach rank 1
Double Tap: Reach level 36
Extreme conditioning: Reach rank 1
Fireproof: Reach level 48
Fireworks: Reach rank 1
Flak Jacket: Reach rank 1
Gas Mask: Reach rank 2
Greased Bearings(Vehicle): Reach rank 2
Iron Lungs: Reach level 60
Juggernaut: Reach level 4
Leadfoot(vehicle): Reach level 28
M2 Flamethrower: Reach level 65
M9A1 Bazooka x2: Reach rank 2
Martydom: Reach level 20
Ordiance Training(vehicle): Reach level 12
Overkill: Reach level 56
Primary Grenades x 2: Reach level 44
Reconnaissance: Reach level 64
Satchel charge x2: Reach rank 1
Second Chance: Reach level 9
Shades: Reach level 32
Sleight of Hand: Reach level 28
Special grenades x3: Reach rank 1
Steady Aim: Reach rank 1
Stopping power: Reach rank 1
Toss Back: Reach level 6
Water cooler(vehicle): Reach rank 1

Unlock Sgt. Reznow Gamer Picture
Reach 10th Prestige.

Prestige Gamer Pictures
As you rise up in the ranks up Prestige, you will unlock gamer pictures matching each Prestige symbol.

1st-10th Prestige Gamer Pictures: Reach Prestige 1st-10th.

Colored Clan Tags
When entering your clan tag, enter in the following code to achieve the desired colors. Capitalization does not matter.

blue: blue clan tag
cyan: cyan (light blue) clan tag
grn: green clan tag
red: red clan tag
yelw: yellow clan tag

Online Multiplayer Challenges
Complete the following challenges online to unlock the following:

Aperture Sight for Gewehr 43: Get 75 kills with the Gewehr 43
Aperture Sight for M1A1 Carbine: Get 75 kills with the M1A1 Carbine
Aperture Sight for MP40: Get 75 kills with the MP40
Aperture Sight for PPSh-41: Get 25 kills with the PPSh-41
Aperture Sight for STG-44: Get 75 kills with the STG-44
Aperture Sight for SVT-40: Get 75 kills with the SVT-40
Aperture Sight for Thompson: Get 75 kills with the Thompson
Aperture Sight for Type 100: Get 25 kills with the Type 100
Bayonet for Arisaka: Get 75 kills with the Arisaka
Bayonet for Kar98K: Get 75 kills with the Kar98K
Bayonet for M1 Garand: Get 75 kills with the M1 Garand
Bayonet for M1897 Trench Gun: Get 75 kills with the M1897 Trench Gun
Bayonet for M1A1 Carbine: Get 100 kills with the M1A1 Carbine
Bayonet for Mosin-Nagant: Get 75 kills with the Mosin-Nagant
Bayonet for Springfield: Get 25 kills with the Springfield
Bayonet for Type 99: Get 75 kills with the Type 99
Bipod for BAR: Get 25 kills with the BAR
Bipod for Browning M1919: Get 25 kills with the Browning M1919
Bipod for DP-28: Get 25 kills with the DP-28
Bipod for FG42: Get 25 kills with the FG42
Bipod for MG42: Get 25 kills with the MG42
Bipod for Type 99: Get 25 kills with the Type 99
Box Magazine for M1A1 Carbine: Get 150 kills with the M1A1 Carbine
Dual Magazines for MP40: Get 150 kills with the MP40
Extended Clip for Type 100: Get 25 kills with the Type 100
Flash Hider for M1 Garand: Get 25 kills with the M1 Garand
Flash Hider for M1A1 Carbine: Get 25 kills with the M1A1 Carbine
Flash Hider for STG-44: Get 25 kills with the STG-44
Flash Hider for SVT-40: Get 25 kills with the SVT-40
Grip for Double Barreled Shotgun: Get 25 kills with the Double Barreled Shotgun
Grip for M1897 Trench Gun: Get 25 kills with the M1897 Trench Gun
Rifle Grenade for Arisaka: Get 150 kills with the Arisaka
Rifle Grenade for Gewehr 43: Get 150 kills with the Gewehr 43
Rifle Grenade for Kar98K: Get 150 kills with the Kar98K
Rifle Grenade for M1 Garand: Get 100 kills with the M1 Garand
Rifle Grenade for Mosin-Nagant: Get 150 kills with the Mosin-Nagant
Rifle Grenade for Springfield: Get 75 kills with the Springfield
Round Drum for PPSh-41: Get 75 kills with the PPSh-41
Round Drum for Thompson: Get 150 kills with the Thompson
Sawed-Off Shotgun: Get 75 kills with the Double Barreled Shotgun
Sniper Scope for Arisaka: Get 25 kills with the Arisaka
Sniper Scope for Kar98K: Get 25 kills with the Kar98K
Sniper Scope for M1 Garand: Get 150 kills with the M1 Garand
Sniper Scope for Mosin-Nagant: Get 25 kills with the Mosin-Nagant
Suppressor for Gewehr 43: Get 25 kills with the Gewehr 43
Suppressor for MP40: Get 25 kills with the MP40
Suppressor for Thompson: Get 25 kills with the Thompson
Suppressor for Type 100: Get 25 kills with the Type 100
Telescopic Sight for FG42: Get 75 kills with the FG42
Telescopic Sight for STG-44: Get 100 kills with the STG-44
Telescopic Sight for SVT-40: Get 150 kills with the SVT-40
Telesopic Sight for Gewehr 43: Get 100 kills with the Gewehr 43

Extra custom classes
Reach certain Prestiges to unlock more custom classes.

Custom Class 6: Reach 1st Prestige
Custom Class 7: Reach 2nd Prestige
Custom Class 8: Reach 4th Prestige
Custom Class 9: Reach 7th Prestige
Custom Class10: Reach 10th Prestige