- 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.

- 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.

- 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

- 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

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

- 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


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