Mile High Club mission
Successfully complete Story mode on any difficulty setting to unlock the Mile High Club mission.

Prestige mode
Reach level 55 to unlock Prestige mode. This is a multiplayer only mode that starts you back at level 1. You can repeat this ten more times.

Golden weapons
Successfully complete the indicated task to unlock the corresponding golden weapon camouflage. Note: The golden version of the weapons does not boost any attributes and is just purely cosmetic.

Golden Ak-47: Successfully complete all Assault Rifle challenges.
Golden Desert Eagle: Reach level 55.
Golden Dragonuv: Successfully complete all Sniper challenges.
Golden M1014: Successfully complete all Shotgun challenges.
Golden M60: Successfully complete all LMG challenges.
Golden Mini-Uzi: Successfully complete all SMG challenges.

Rank bonuses
Reach the indicated rank in Multiplayer mode to unlock the corresponding bonus:

Private

Level 1: All starting equipment
Level 2: Demolitions Class Weapon Class
Level 3: Sniper Class Weapon Class

Lance Corporal

Level 4: Create a Class
Level 5: Gun Challenges
Level 6: New playlists

Corporal

Level 7: M21 Sniper Rifle
Level 8: Last Stand Perk Class 3
Level 9: Boot Camp Challenges 1

Sergeant

Level 10: M4 Carbine Assault Rifle
Level 11: UAV Jammer Perk Class 2
Level 12: Clan Tag

Staff Sergeant

Level 13: Mini Uzi Submachine Gun Level 14: Bomb Squad Perk Class 1 Level 15: Boot Camp Challenges 2

Gunnery Sergeant

Level 16: M1911 Pistol
Level 17: Martyrdom Perk Class 2
Level 18: Boot Camp Challenges 3

Master Sergeant

Level 19: M60E4 Light Machine Gun
Level 20: Sleight of Hand Perk Class 2
Level 21: Operations Challenges

Master Gunnery Sergeant

Level 22: Dragunov Sniper Rifle
Level 23: Claymore Perk Class 1
Level 24: Operations Challenges 2

2nd Lieutenant

Level 25: G3 Assault Rifle
Level 26: Iron Lungs Perk Class 3
Level 27: Operations Challenges 3

1st Lieutenant

Level 28: AK-74U Submachine Gun
Level 29: Double Tab Perk Class 2
Level 30: Killer Challenges

Captain

Level 31: M1014 Shotgun
Level 32: Bandolier Perk Class 1
Level 33: Killer Challenges 2

Major

Level 34: R700 Sniper Rifle
Level 35: Eavesdrop Perk Class 3
Level 36: Killer Challenges 3

Lieutenant Colonel

Level 37: G36C Assault Rifle
Level 38: Overkill Perk Class 2
Level 39: Killer Challenges 4

Colonel

Level 40: P90 Submachine Gun
Level 41: Frag x3 Perk Class 1
Level 42: Humiliation Challenges

Brigadier General

Level 43: Desert Eagle Pistol
Level 44: Dead Silence Perk Class 3
Level 45: Humiliation Challenges 2

Major General

Level 46: M14 Assault Rifle
Level 47: Humiliation Challenges 3
Level 48: Humiliation Challenges 4

Lieutenant General

Level 49: Barret Sniper Rifle
Level 50: Humiliation Challenges 5
Level 51: Elite Challenges

Commander

Level 52: MP44 Assault Rifle
Level 53: Elite Challenges 2
Level 54: Elite Challenges 3
Level 55: Commander Prestige Mode and Golden Desert Eagle

Better accuracy
Once you get the Red Dot Scope add-on to your weapons, use it over the ACOG scope. The red dot will not enhance or take away anything and provides a better aim point on most weapons. The ACOG scope will actually add more range to your weapon, but take away accuracy which accomplishes almost nothing, especially for snipers because it takes away range and adds nothing.

Better sniping
If a target is moving, make sure to lead it. If you are not making shots, try to lead your target more. Also, if you are a skilled sniper, try using the M40A3 over the M21. It has a slower reload time and rate of fire, but it has enough damage to kill a target in one shot instead of two or three. It also allows you to be less noticeable with less rounds being fired so someone else cannot follow the tracer shot back to you. A good setup for the sniper is the Claymore Perk to alert you when an enemy is trying to close in on your rear, and either the Sleight Of Hand or Stopping Power, then Iron Lungs to give you more time to line up your shots.

Good sniping location in Crossfire map in Multiplayer mode
This spot can only be reached when you are playing the old school free-for-all section. Go to the building at the very end of the map on the opposite side of the bus. You can get to the very top of the building that is around the corner. First, get to the second story where the chair is found. Get on the top of the chair facing the wall, and jump. You may have to run and jump, but eventually you will catch an edge. You can then work your way up to a great sniping position.

Dog attack in All Ghillied Up mission
In the "All Ghillied Up" mission, you will come across a wild dog eating a dead soldier's remains. You will be told to leave it alone, but if you want a very difficult challenge in the game, shoot it. You will be attacked by a large pack of angry dogs.

Achievements
Accomplish the indicated achievement to get the corresponding number of Gamerscore points. Note: Enabling cheats will prevent achievements from being earned.

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.
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.
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 First Horseman (40 points): Complete 'Shock and Awe' on Veteran difficulty.
The Second Horseman (40 points): Complete 'Safehouse' on Veteran difficulty.
The Fourth Horseman (40 points): Complete 'Game Over' on Veteran difficulty.

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