Complete Campaign mode on any difficulty to unlock the cheat menu. The cheat menu is available under "Options" in the pause menu. Find Intel pieces to unlock the following cheats.
- A Bad Year - Find 15 Intel
- Cluster Bombs - Find 10 Intel
- CoD Noir - Find 02 Intel
- Infinite Ammo - Find 30 Intel
- Paintball - Find 08 Intel
- Photo-Negative - Find 04 Intel
- Slow-Mo Ability - Find 20 Intel
- Super Contrast - Find 06 Intel
Reach the following multiplayer levels to unlock perks, challenges and more:
- 3x Frag (Perk Slot 1) - Level 41
- AK-47U - Level 28
- Bandolier (Perk Slot 1) - Level 32
- Barret .50 Cal - Level 49
- Bomb Squad (Perk Slot 1) - Level 14
- Boot Camp Challenges 1 - Level 09
- Boot Camp Challenges 2 - Level 15
- Boot Camp Challenges 3 - Level 18
- Clan Tag - Level 12
- Claymores - Level 23
- Create-a-Class - Level 04
- Dead Silence (Perk Slot 3) - Level 44
- Demolitions Class - Level 02
- Desert Eagle - Level 43
- Double Tap (Perk Slot 2) - Level 29
- Dragunov - Level 22
- Eavesdrop (Perk Slot 3) - Level 35
- Elite Challenges - Level 51
- Elite Challenges 2 - Level 53
- Elite Challenges 3 - Level 54
- G3 - Level 25
- G36C - Level 37
- Golden Desert Eagle - Level 55
- Gun Challenges - Level 05
- Humiliation Challenges 1 - Level 42
- Humiliation Challenges 2 - Level 45
- Humiliation Challenges 3 - Level 47
- Humiliation Challenges 4 - Level 48
- Humiliation Challenges 5 - Level 50
- Iron Lungs (Perk Slot 3) - Level 26
- Killer Challenges 1 - Level 30
- Killer Challenges 2 - Level 33
- Killer Challenges 3 - Level 36
- Killer Challenges 4 - Level 39
- Last Stand (Perk Slot 3) - Level 08
- M1014 - Level 31
- M14 - Level 46
- M1911 - Level 16
- M21 - Level 07
- M4 Carbine - Level 10
- M60E4 - Level 19
- Martyrdom - Level 17
- Mini-Uzi - Level 13
- MP44 - Level 52
- New Playlists - Level 06
- Operations Challenges 1 - Level 21
- Operations Challenges 2 - Level 24
- Operations Challenges 3 - Level 27
- Overkill (Perk Slot 2) - Level 38
- P90 - Level 40
- Prestige Mode - Level 55
- R700 - Level 34
- Sleight of Hand (Perk Slot 2) - Level 20
- Sniper Class - Level 03
- UAV Jammer (Perk Slot 2) - Level 11
