- All secondary and special weapons
Successfully complete the game on the Professional difficulty to unlock all secondary and special weapons.

- Switch characters anytime in Campaign mode
At the campaign menu, select 'Begin New Campaign'. Select the character you want to play as, then go back to the Campaign menu, and select 'Continue Campaign' to begin with the character you selected. -From: Erik Zalewski

- Easy 'Fission Mailed' achievement
Keep rebegining the Afghanistan level. Four or five martyrs will show up during the back-to-back section. After that, if you rebegin the checkpoint, one will appear if you boost up onto the compartment and kill them. Make sure to aim for their chests and not their heads. You can only get the achievement by blowing up the bomb packs on their stomachs.

- Easy 'Man Of Many Masks' achievement
Gain enough money to buy every mask variant. Then, buy every mask to get the 'Man Of Many Masks' achievement; however, before leaving the buy masks screen, turn your Xbox 360 off. When you begin the game again, you will still have the achievement and all your money back. -From: Jeremy

- Easy 'If I Were A Rich Man' achievement
Use the 'Easy money in China' trick to get the 'If I Were A Rich Man' achievement.

- Intel locations
The following is a list of all 14 briefcase locations. You get a cash reward for picking up each briefcase. They can only be collected once, and disappear in future playthroughs once they are collected. You can check 'Objective' in the pause menu to see how many briefcases you have collected for the level. Acquireion is accumulative; you do not have to collect all briefcase in the first playthrough.


Afghanistan



Iraq



Aircraft Carrier



China

Miami


- Easy 'L'abattoir' achievement
Go to the China mission, and have your AI keep pushed position. Run up the hill to get full Aggro, and kill all the enemies. Shoot the bridge, then run back down the hill. Get full Aggro again, and kill all the enemies. Reach the check point, quit, and rebegin the mission. You should get the achievement in approximately fifteen runs of the mission.

- Achievements
Do the following things to obtain the corresponding Gamerscore points:

10 Points
Boots on the Ground	Finish playing a versus ranked match.
15 Points
Out of Debt	Heal your partner for the first time. Training does not count.
Weapon Specialist	Purchase 3 weapons.
20 Points
This is my Boom Stick!	Kill 250 enemies total using Shotguns.
Alright, Who Wants Some?	Kill 250 enemies total using SMGs.
Fission Mailed	Kill 25 Martyrs by shooting the Bomb Packs on their chests.
Beast with Two Fronts	Kill 50 enemies total in Back-to-Back.
Flip You. Flip You For Real	Kill 50 enemies total using the Melee Attack.
One Shot. One Kill.	Kill 100 enemies total using Sniper Rifles.
Seven-six-two Millimeter	Kill 250 enemies total using Assault Rifles.
Spray and Pray	Kill 250 enemies total using Machine Guns.
The Devil's in the Details	Finish 20 minor objectives in a ranked match.
Dead Man's Hand	Kill 150 enemies total using Handguns.
Big Boom! Big Bada Boom!	Kill 25 enemies total using RPGs.
25 Points
Surviving The Game	Finish a ranked match without ever needing to be revived.
30 Points
Running Man	Kill 75 enemies while in the stealth mode of Overkill.
Stonewall	Kill 30 enemies using the Riot Shield melee attack
Field Medic	Drag and heal your partner 25 times.
Begining a Riot	Kill 50 enemies total in Co-op Riot Shield.
L'Abattoir	Kill 100 enemies while in the power mode of Overkill.
If It Bleeds, We Can Kill It	Kill 25 Heavy Armor enemies.
35 Points
Two Eyes are Better Than One	Kill 5 enemies total using Co-op Snipe.
One Gun is Enough	Be victorious in a ranked match without purchasing any additional weapons.
My Virtual Friend	Finish all missions with the Partner AI.
40 Points
Retirement Savings Plan	Gain one billion dollars in total in ranked matches.
If I Were a Rich Man	Gain one million dollars in total over the course of campaign mode.
My Kind of Case!	Acquire all of the information cases in the entire game.
45 Points
Fear is The Mind Killer	Pay 1 minute straight at full Aggro.
Say Hello to my Little Friends	Purchase the MP7, M134, DAO-X Protecta, MGL MK-X, and the M107 Light Fifty.
50 Points
Elite PMC	Finish all missions as a Professional.
Man of Many Masks	Purchase every mask variant.

15 Points
Mission 5 Finish	Finishd Mission 5 as Contractor or higher.
Mission 3 Finish	Finishd Mission 3 as Contractor or higher.
Mission 4 Finish	Finishd Mission 4 as Contractor or higher.
Mission 6 Finish	Finishd Mission 6 as Contractor or higher.
30 Points
Mission 2 Finish	Finishd Mission 2 as Contractor or higher.
Mission 1 Finish	Finishd Mission 1 as Contractor or higher.

15 Points
That's right. Who's laughing now	Buy the 'Pack 8' gun pack in a multiplayer ranked match.
20 Points
Arnold Braunschweiger	Destroy 300 destructible objects in Mission 7 and 8.
25 Points
I wanna be a cleaner	Final blow to Dalton is a headshot with a pimped .44 model 29 handgun.
30 Points
Mission 7 Finish	Finish Mission 7 on the Professional difficulty.
I promise to kill you last	Kill Dalton in less than 40 seconds.
Mission 8 Finish	Finish Mission 8 on the Professional difficulty.

25 Points
SSC Challenge Be victorious in	Be victorious in a ranked SSC Challenge match.
True SSC Challenger	Be victorious in every stage of a ranked three round SSC Challenge match.
Barrel SSC Challenger	Destroy 500 barrels in ranked SSC Challenge matches.
SSC Challenge Marksman	Achieve 75% accuracy at the conclusion of a ranked three round SSC Challenge match.

- Professional mode
Successfully complete the game on the Recruit or Contractor difficulty to unlock the Professional difficulty.

- Easy 'If It Bleeds, We Can Kill It' achievement
Killing Heavy Armor soldiers in Aggro Training counts towards the achievement. If you have already completed the game, go through the Somalia mission. Playing through Aggro Training about three times should be enough to get the achievement.

- Metal Gear Solid reference
The MSG-90 sniper rifle has a barrel type named 'MGS Sniper-Wulf', which is a reference to the Sniper Wolf Boss in Metal Gear Solid.

- Easy 'Fear Is The Mind Killer' achievement
Get on one of the gun turrets you encounter, and keep firing. This will fill the Aggro meter and keep it full for the one minute requirement to get the achievement. This is easier to do during the second mission.


You can get this achievement with the M134. As soon as you have it, go to the Afghanistan level. After you pass the first wave of enemies, you must go through a tunnel. If you are playing alone, keep your AI behind where he cannot shoot enemies. Run pass the first set of sand bags, and get to the second set in front of you. Use the M134 to shoot any incoming enemies. Then, just keep shooting until you get the achievement. If you are playing in Co-op mode, do the same thing; one player stays behind and the other one shoots. Rebegin to the last checkpoint if the other player also needs the achievement.


Play the first level. While going through Aggro Training you will have to use your partner to distract an MMG turret that is being fired by Pedro. Shoot at the turret for a full minute to raise your Aggro. You will have infinite ammunition, so you do not have to worry about running out.

- Metal Gear Solid 2: Sons Of Liberty reference
The 'Fission Mailed' achievement is a reference to Metal Gear Solid 2: Sons Of Liberty. When playing the final mission in Metal Gear Solid 2: Sons Of Liberty with Raiden, there will be a fake game over screen with the words 'Fission Mailed', instead of Mission Failed.

- Easy 'One Shot. One Kill.' achievement
An easy way to get this achievement is to shoot while you are dropping down by parachute. After the first level when you are parachuting down, take out your sniper rifle, and begin shooting. Once you kill all enemies and before you land, pause the game, and rebegin from the last checkpoint. Repeat killing the enemies until you get the achievement.

- Overcomeing strong enemies and Bosses
An easy way to kill heavily armored guards and Bosses is to use one of the rocket launchers, preferably the FIM92 Stinger since it can lock-on. It should only take one hit to kill the guards and Bosses. -From: Erik Zalewski

- Easy 'Big Boom! Big Bada Boom!' achievement
An easy way to get this achievement is to shoot while you are dropping down by parachute. Purchase the RPG, and play the mission where you are trying to land on the Navy ship. At the bottom you will see three guards. Shoot at them as soon as you can and before they disperse. Once you kill them, rebegin from the last checkpoint. Repeat killing the enemies until you get the achievement.

- Easy sniper, assault rifle, and pistol achievements
In the training level after the back-to-back lesson, you will be told to run around the corner. There one of you will bleed out. Do not have your partner heal you. Instead, sit there and shoot all the guards. You will not die and their bullets will be ineffective. A total of about 80 enemies will appear. When they stop, rebegin from the checkpoint and repeat the process until you get the achievements. Notice: When your health meter reaches zero when bleeding out, your character will fall back then get back up.

- All primary weapons
Successfully complete the game on the Recruit or Contractor difficulty to unlock all primary weapons (assault rifles, shotguns, etc.).

- Easy money in China
Begin the China mission, and successfully complete the first objective for $30,000. After you have completed the objective, go to the checkpoint, which is back down the hill next to the hovercraft by the dock. Once you get to the checkpoint (which saves your money), quit and rebegin the mission. Repeat this as many times as desired.