Completion bonuses - Successfully complete the game on any difficulty setting to unlock the cheat menu and Arcade mode.

The cheat menu can be found at the options menu while playing the game.

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

Make the Jump (20 points): Infiltrate a cargo ship.
Earn a Winged Dagger (20 points): Complete 'F.N.G.'.
Win the War (40 points): Complete the game on any difficulty.
Dancing in the Dark (20 points): Kill the power.
Save the Bacon (20 points): Protect 'War Pig', the Abrams tank.
Death From Above (20 points): Operate an AC-130 gun ship.
Wrong Number (20 points): Find Al-Asad's safehouse.
Piggyback Ride (20 points): Carry Cpt. MacMillian to safety.
Desperate Measures (20 points): Corner Zakhaev's Son.
Look Sharp (20 points): Find 15 enemy intel items.
Eyes and Ears (20 points): Find 30 enemy intel items.
Down Boy Down (20 points): Survive a dog attack.
New Squadron Record (20 points): Complete the cargo ship mockup in less than 20 seconds.
Rescue Roycewicz (20 points): Save Pvt. Roycewicz on the stairs.
Your Show Sucks (20 points): Destroy all the TVs showing Al-Asad's speech.
Man of the People (10 points): Save the farmer.
Straight Flush (20 points): Kill 5 enemies with one shot while in the AC-130 gunship.
Ghillies In The Mist (20 points): Complete 'All Ghillied Up' without alerting any enemies.
Mile High Club (20 points): Sky dive to safety on Veteran difficulty.
No Rest for the Weary (10 points): Stab an injured crawling enemy.
Deep and Hard (90 points): Complete the game on Hardened or Veteran difficulty.
The Package (40 points): Complete 'Crew Expendable' on Veteran difficulty.
The Rescue (40 points): Complete 'Blackout' on Veteran difficulty.
The Search (40 points): Complete 'Charlie Don't Surf' on Veteran difficulty.
The Bog (40 points): Complete 'The Bog' and 'War Pig' on Veteran difficulty.
The Escape (40 points): Complete 'Hunted' and 'Death From Above' on Veteran difficulty.
The First Horseman (40 points): Complete 'Shock and Awe' on Veteran difficulty.
The Second Horseman (40 points): Complete 'Safehouse' on Veteran difficulty.
The Shot (40 points): Complete 'All Ghillied Up' and 'One Shot, One Kill' on Veteran difficulty.
The Third Horseman (40 points): Complete 'Heat' and 'The Sins of the Father' on Veteran difficulty.
The Ultimatum (40 points): Complete 'Ultimatum', 'All In', and 'No Fighting in the War Room' on Veteran difficulty.
The Fourth Horseman (40 points): Complete 'Game Over' on Veteran difficulty.
Daredevil (10 points): Kill an enemy while blinded by a flashbang in the single player campaign.
Roadkill (10 points): Kill 2 enemies by blowing up a car in the single player campaign.
Bird on the Ground (20 points): Shoot down an enemy helicopter with an RPG in the single player campaign.
Four of a Kind (20 points): Kill 4 enemies in a row with headshots in the single player campaign.
Three of a Kind (10 points): Kill 3 enemies in a row with your knife in the single player campaign.