Survival mode:
Choose “War Room” at the main menu, then select “Options”. Enter Select, L, R, Select, Y, Y, X, R, L, X, R, Y as a password to unlock Survival mode for your current game session.
Unlockables:
Unlock the following bonuses by performing the corresponding tasks:
Shooting gallery – Score a kill with all gun models. The shooting gallery allows you to test out all of the available guns.
Survival mode – Complete the game under the Hardened difficulty setting.
Weapons room – Use every weapon to kill an enemy.
Arcade mode – Complete Campaign mode under the Regular or Hardened difficulty.
Mini-Game mode – Complete Campaign mode.
Unlockable Weapons:
Unlock the following weapons by reaching the corresponding number of kills on the listed side in Multi-player mode:
Red/Insurgency
WEAPON – KILLS
Skorpion Machine Pistol – 50 kills.
AN94 Assault Rifle – 150 kills.
Steyr AUG A3 – 300 kills.
Heckler-Koch HK MG4 – 500 kills.
Blue/Coalition
WEAPON – KILLS
M4 with Red Dot Scope – 50 kills.
AA12 Automatic Shotgun – 150 kills.
P90 Sub Machine Gun – 300 kills.
M249 SAW Machine Gun – 500 kills.