Unlockables - Accomplish the indicated achievement to get Gamerscore points.

Architect (30 points) Complete 'Vendetta' on Veteran difficulty. (Solo only).
Bearing the Burden (30 points) Complete 'Downfall' on Veteran difficulty. (Solo only).
Bloody Peleliu (30 points) Complete 'Little Resistance' on Veteran difficulty. (Solo only).
Blowtorch & Corkscrew (30 points) Complete 'Blowtorch & Corkscrew' on Veteran difficulty. (Solo only).
Blue Ribbon (25 points) Complete a 4-player Competitive Co-Op match in 1st place over Xbox LIVE. (Online co-op only).
Carlson's Raiders (10 points) Complete 'Semper Fi' on any difficulty. (Solo only).
Close Shave (10 points) Survive a Banzai attack. (Solo only).
Fearless (30 points) Complete 'Relentless' on Veteran difficulty. (Solo only).
Firestarter (15 points) Complete a mission using only the flamethrower. (Melee, grenades and explosives are OK). (Solo or co-op).
For the Motherland (30 points) Complete 'Heart of the Reich' on Veteran difficulty. (Solo only).
Get Your Hands Dirty (30 points) Complete 'Semper Fi' on Veteran difficulty. (Solo only).
Get Your Left Foot Wet (30 points) Complete a match in Campaign Co-Op mode over Xbox LIVE. (Online co-op only).
Get Your Right Foot Wet (30 points) Complete a match in Competitive Co-Op mode over Xbox LIVE. (Online co-op only).
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).
Its All About Prestige (0 Points) You Achieved the first level of prestige. Only 9 more to go
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).

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.