Easy Level Up
First, you need 2 players. Second, one of you get a riot shield class pick a map doesnt matter wich one then let the other person get a sentry gun then the person with the riot shield back up against the wall then place the sentry gun in front of the guy with the riot shield you will get points but they will go down when they do press x to move the sentry gun put it down exactly where it was before and the points will get higher and then start to get lower again repeat this untill your really bored happy leveling up.
Extra Custom Class Slot
Reach level 70 in multiplayer and enter Prestige mode to unlock a sixth custom class slot.
Professional Perks
You can upgrade each perk you unlock by completing various requirements.
| Unlockable | How to Unlock |
|---|---|
| Bling Pro (2 Primary Weapon Attachments + 2 Secondary Weapon Attachments) | Get 200 Kills with a Weapon with Two Attachments |
| Cold-Blooded Pro (Undetectable by UAV, air support, sentries, and thermal imaging + No Red Crosshair or Name when you are Targeted) | Destroy 40 enemy Killstreak Rewards with Cold-Blooded Perk |
| Commando Pro (Increased Melee Distance + No Falling Damage) | Get 20 Melee Kills using Commando Perk |
| Danger Close Pro (Increased Explosive Weapon Damage + Extra Air Support Damage) | Get 100 Kills with Explosives while using Danger Close Perk |
| Hardline Pro (Killstreak Rewards require 1 less Kill + Deathstreak Rewards require 1 less Death) | Get 40 Killstreaks (2 or more in a row without dying) with Hardline Perk |
| Lightweight Pro (Move Faster + Quick Aim after Sprinting) | Run 30 Miles with Lightweight Perk |
| Marathon Pro (Unlimited Sprint + Climb Obstacles Faster) | Run 26 Miles with Marathon Perk |
| Ninja Pro (Invisible to Heartbeat Sensors + Your footsteps are Silent) | Get 50 Close Range Kills using Ninja Perk |
| Scavenger Pro (Resupply from Dead Enemies + Extra Mags) | Resupply 100 times with Scavenger Perk |
| Scrambler Pro (Jam Enemy Radar Near you + Delay Enemy Claymore Explosions) | Get 50 Close Range Kills using Scrambler Perk |
| Sitrep Pro (Detect Enemy Explosives and Tactical Insertions + Louder Enemy Footsteps) | Destroy 120 Detected Explosives or Tactical Insertions with Sitrep Perk |
| Sleight of Hand Pro (Faster Reloading + Faster Aiming) | Get 120 Kills with Sleight of Hand Perk |
| Steady Aim Pro (Increased Hip Fire Accuracy + Longer Hold Breath Duration) | Get 80 Hip Fire Kills using Steady Aim |
| Stopping Power Pro (Extra Bullet Damage + Extra Damage to Enemy Vehicles) | Get 300 Kills with Stopping Power Perk |
Unlock the Museum
Once you've completed the game, the Museum can be selected from the "Mission Select" screen.
Killstreak Rewards
| Unlockable | How to Unlock |
|---|---|
| AC130 Gunship (be the gunner of the AC130) | 11 Kills |
| Attack Helicopter | 07 Kills |
| Care Package (drops ammo/killstreaks) | 04 Kills |
| Chopper Gunner (be the gunner of the Helicopter) | 11 Kills |
| Counter UAV (jams enemy radar's) | 04 Kills |
| Emergency Airdrop (4 ammo/killstreak drops) | 08 Kills |
| EMP (disables electronics) | 15 Kills |
| Harrier Strike (choose bomb location and defending Harrier) | 07 Kills |
| Nuclear Strike (kills everyone on map) | 25 Kills |
| Pave Low (Armored Helicopter) | 09 Kills |
| Precision Airstrike (drop airstrike) | 06 Kills |
| Predator (guided missles) | 05 Kills |
| Sentry Gun (deployable gun) | 05 Kills |
| UAV (shows enemy location) | 03 Kills |
Achievements
| Unlockable | How to Unlock |
|---|---|
| Back in the Saddle (15) | Help train the local militia. |
| Black Diamond (25) | Complete 'Cliffhanger' on Veteran Difficulty. |
| Blackjack (20) | Earn 21 stars in Special Ops. |
| Charlie On Our Six (20) | Earn 8 stars in Special Ops. |
| Cold Shoulder (15) | Infiltrate the snowy mountain side base. |
| Colonel Sanderson (10) | Kill 7 chickens in under 10 seconds in 'The Hornet's Nest'. |
| Danger Close (15) | Get hand picked for Shepherd's elite squad. |
| Desperado (10) | Kill 5 enemies in a row using 5 different weapons or attachments in Single Player or Special Ops. |
| Desperate Times (15) | Execute the plan to help the Americans. |
| Downed but Not Out (10) | Kill 4 enemies in a row while downed in Special Ops. |
| Drive By (10) | Kill 20 enemies in a row while driving a vehicle in Single Player or Special Ops. |
| Ends Justify the Means (25) | Complete 'Contingency' on Veteran Difficulty |
| First Day of School (25) | Complete 'S.S.D.D' and 'Team Player' on Veteran Difficulty. |
| For the Record (35) | Complete the Single Player campaign on any difficulty. |
| Ghost (10) | Plant the C4 in 'Cliffhanger' without alerting or injuring anyone in the blizzard. |
| Gold Star (20) | Earn 1 star in Special Ops. |
| Homecoming (25) | Complete 'Of Their Own Accord', 'Second Sun', and 'Whiskey Hotel' on Veteran Difficulty. |
| Honor Roll (20) | Earn at least 1 star in each Special Op mission. |
| Hotel Bravo (20) | Earn 4 stars in Special Ops. |
| I'm the Juggernaut... (10) | Kill a Juggernaut in Special Ops. |
| It Goes to Eleven (20) | Earn at least 1 star in 11 different Special Op missions. |
| Knock-knock (10) | Kill 4 enemies with 4 shots during a slow-mo breach in Single Player or Special Ops. |
| Leave No Stone Unturned (10) | Collect 45 enemy intel items. |
| Look Ma Two Hands (10) | Kill 10 enemies in a row using akimbo weapons in Single Player or Special Ops. |
| No Rest For the Wary (10) | Knife an enemy without him ever knowing you were there in Single Player or Special Ops. |
| Off the Grid (25) | Complete 'Just Like Old Times' and 'Endgame' on Veteran Difficulty. |
| Operational Asset (20) | Earn all 3 stars in at least 5 different Special Op missions. |
| Operative (30) | Earn all 3 stars in at least 10 different Special Op missions. |
| Out of the Frying Pan... (15) | Complete the mission in the airplane graveyard. |
| Pit Boss (10) | Run The Pit in 'S.S.D.D' and finish with a final time under 30 seconds. |
| Prisoner #627 (25) | Complete 'The Only Easy Day... Was Yesterday' and 'The Gulag' on Veteran Difficulty. |
| Professional (30) | Earn all 3 stars in at least 15 different Special Op missions. |
| Queen takes Rook (25) | Complete 'Loose Ends' and 'The Enemy of My Enemy' on Veteran Difficulty. |
| Red Dawn (25) | Complete 'Wolverines!' and 'Exodus' on Veteran Difficulty. |
| Royale with Cheese (15) | Defend Burger Town. |
| Soap on a Rope (15) | Storm the gulag. |
| Some Like it Hot (10) | Kill 6 enemies in a row using a thermal weapon in Single Player or Special Ops. |
| Specialist (30) | Earn 30 stars in Special Ops. |
| Star 69 (90) | Earn 69 stars in Special Ops. |
| Tag 'em and bag 'em (15) | Find Rojas in the Favelas. |
| Ten plus foot-mobiles (10) | Kill at least 10 enemies with one Predator missile in Single Player or Special Ops. |
| The Harder They Fall (10) | Kill 2 rappelling enemies in a row before they land on their feet in Single Player or Special Ops. |
| The Pawn (15) | Assault Makarov's safe house. |
| The Price of War (90) | Complete the single player campaign on Hardened or Veteran Difficulty. |
| The Road Less Traveled (10) | Collect 22 enemy intel items. |
| Three-some (10) | Kill at least 3 enemies with a single shot from a grenade launcher in Single Player or Special Ops. |
| Turistas (25) | Complete 'Takedown' and 'The Hornet's Nest' on Veteran Difficulty. |
| Two Birds with One Stone (10) | Kill 2 enemies with a single bullet in Single Player or Special Ops. |
| Unnecessary Roughness (10) | Use a riot shield to beat down an enemy in Single Player or Special Ops. |
| Whiskey Hotel (15) | Take back Whiskey Hotel. |
