Level select and pictures:
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Hold Back and press Right(2), Left(2), X(2) at the chapter selection screen.

Achievements:
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Complete the following achievements to unlock Xbox Live Gamerscore points.

Basic Training (5 points): Complete the basic training in the beginning of Saint Lo.5

American Infantryman (20 points): Complete two missions as an American soldier.

British Commando (20 points): Complete two missions as a British soldier.

Canadian Highlander (10 points): Complete two missions as a Canadian soldier.

Polish Tanker (15 points): Complete two missions as a Polish soldier.

Won the War (80 points): Complete the single player campaign on any difficulty setting.

Hot Potato (25 points): Pick up and return 5 live grenades.

Rifleman (15 points): Complete a mission by firing only bolt action rifles.
Melee attacks don't count.

Assault Trooper (15 points): Complete a mission by firing only assault rifles.
Melee attacks don't count.

Battlefield Scavenger (15 points): Complete a mission by firing only German weapons.
Melee attacks don't count.

Still Ticking (30 points): Complete a mission without dying or using checkpoints.

Allergic to Bullets (25 points): Avoid getting hit more than 30 times during a
mission.

Conservationist (20 points): Complete a mission using less than 300 rounds of
ammunition.

Close Quarter Combatant (100 points): Complete a mission without firing a round.
Player can make use of melee attacks and hand grenades.

Grizzled Veteran (150 points): Complete the Single Player Campaign on Veteran
difficulty.

Supply Officer (15 points): Supply ammunition to at least 20 friendly soldiers
in a single ranked multi-player match.

Doc (30 points): Revive 10 of your teammates in a ranked multi-player match
without getting a teamkill.

A War Hero (30 points): Capture the final objective in the game mode War.
Must be a ranked multi-player match.

Victory Medal (30 points): Be the player with the highest score and on the
winning team in a ranked multi-player match.

Lieutenant (20 points): Receive 200 total points in ranked multi-player matches.

Captain (40 points): Receive 2,000 total points in ranked multi-player matches.

Major (60 points): Receive 8,000 total points in ranked multi-player matches.

Colonel (80 points): Receive 20,000 total points in ranked multi-player matches.

General (120 points): Receive 40,000 total points in ranked multi-player matches.

Additionally, there are two secret achievements.

Purple Heart ( points): For perseverance despite grievous injuries.

Big Air - EXTREME! (25 points): Find a big jump and catch some air.