Bonus content codes
At the main menu, select the "Extras" option. Choose the "Bonus Content" option, then enter one of the following codes to activate the corresponding cheat function:

Urban Combat single player level
Enter "sp-street" as a code to unlock the Urban Combat single player level.

Village Assault single player level
Enter "sp-village" as a code to unlock the Village Assault single player level. -From: John Searles

Achievements
Accomplish the indicated achievement to get the corresponding number of Gamerscore points:

Darkness Falls (15 points): Complete the first mission on normal difficulty.
Anvil (15 points): Complete the third mission on normal difficulty or higher.
Captains of Industry (15 points) Complete the second mission on normal difficulty.
Graveyard (15 points): Complete the fourth mission on normal difficulty or higher.
The Mountain King (15 points): Complete the fifth mission on normal difficulty.
Living Quarter (15 points): Complete the sixth mission on normal difficulty.
History Repeats (15 points): Complete the final mission on normal difficulty.
Killing Spree (50 points): Score 5 kills in a row without dying in multiplayer.
Rampage (75 points): Score 10 kills in a row without dying in multiplayer.
Flawless (50 points): Win a ranked match without dying.
Marksman (75 points): Finish a ranked match accuracy level higher than 40%.
Darkness Falls - Stopwatch (25 points): Complete the first missionunder 15 mins.
Anvil - Stopwatch (25 points): Complete the third mission in under 25 minutes.
Captains of Industry - (25 points): Complete 2nd mission in under 25 minutes.
Graveyard - (25 points): Complete the fourth mission in under 50 minutes.

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