Successfully complete all fifty dossier missions. The following codes can now be enabled:
- Invincibility (self)
While playing the game, press Back then press X(2), A, B, A. If you entered the code correctly, a message will appear. Your first soldier will be invincible, but the remaining members of your platoon can still be harmed. Note: You cannot complete the game normally when this code is active, as maps and dossier items can no longer be unlocked.
- Invincibility (team)
While playing the game, press Back then press B, A, Y(2), B, A, X(3). If you entered the code correctly, a message will appear. Note: You cannot complete the game normally when this code is active, as maps and dossier items can no longer be unlocked.
- Big heads
While playing the game, press Back then press A, X, B, Y, A. If you entered the code correctly, a message will appear.
- Big bodies
While playing the game, press Back then press B(2), Y , X (2), A. If you entered the code correctly, a message will appear.
- Chicken explosives
While playing the game, press Back then press X(2), Y, A, B. If you entered the code correctly, a message will appear.
- High pitched voices
While playing the game, press Back then press X, A, Y, B, X. If you entered the code correctly, a message will appear.
- Paper mode
While playing the game, press Back then press B, A, X, Y, A. If you entered the code correctly, a message will appear.
- Slow-motion mode
While playing the game, press Back then and press Y(2), B, X, A. If you entered the code correctly, a message will appear.
- Invincibility (team)
Successfully complete the first twelve missions in campaign mode to unlock all twelve heroes as playable characters in quick mission and campaign modes. They include Henry Ramirez, Nigel Tunney, Will Jacobs, Jack Stone, Guram Osadze, Susan Grey, Klaus Henkel, Buzz Gordon, Lindy Cohen, Astra Galinksy, Scott Ibrahim, and Dieter Munz. Additionally, if you complete the (X) objective for each mission, you will unlock a new soldier. These soldiers have boosted stats and have their own specialist weapons. If these soldiers die, you will not be able to use them except in quick mission mode. You can also use their weapons in multi-player mode.
Successfully complete the fifteen normal missions to unlock an additional eight missions that take place in the desert called "Ghost Recon Desert Siege".
Use the following trick to complete missions without doing the objectives. Play the mission like firefight mode. Once you kill everybody, the mission is automatically complete with all objectives done. Additionally, start a campaign by selecting "Unassign" to empty all team members. Choose only one man for one team (A or B) if you want an easier Medal of Honor, etc. You can keep a second team as a backup at the insertion point and on hold, suppress and in the prone position (if desired), if your one man is properly equipped with the correct weapons to meet all of the objectives. Before any shooting commences, enter the pause menu and choose "Quick Save". Then, seek and destroy all enemies using only this one man team. As soon as you eliminate an enemy or enemies, pause game play again and do another quick save before continuing your mission. If you should somehow get killed, do not select "Restart" during the mission. Instead, select "Reload" and continue from your last quick save.
If you are stuck on a quick mission, try these teams. Team Alpha: any three rifleman; Team Bravo: Henry Ramirez (MP5SD, M9 SD), Nigel Tunney (SA80, M136), and Jack Stone (L96A1, M9 SD). First, put Team Bravo in a safe place and do not switch to them until all of Team Alpha gets killed. Try to get as far as you can with Team Alpha before they die, then switch to Team Bravo. You should be able to complete the mission this way.
On a mission that you are having trouble on, tell the other team to go to a point then follow them. This will help you find where you are supposed to go.
Reload manually before you run out of rounds in that clip. It will reload back to the maximum ammunition for one clip without losing one clip. This can be repeated as many times as desired.
When you have a difficult time seeing where your enemies are shooting at you from, send Team Bravo directly in front of you and look which way they are shooting. You will probably lose many men because of their bad aim, but can always restart the level after you know where they are located to easily take them down the second time. Also, turn on your night vision to see all enemies within your line of sight. Additionally, during any day mission, if you cannot see your enemies turn on the night vision goggles. The opposition will appear as bright white against the lighter green shades of night vision.
If you are a sniper looking for your enemy when he is hiding in the trees, zoom in with your sniper gun. Look around the trees until the crosshairs turn red. When this happens, you can be almost sure that the enemy is there. You can either shoot him or take out your pistol to save yourself some ammo for your sniper gun, since you are already in position. Additionally, when playing in multi-player mode on the city Gold Mt. Level, there is a nice hidden sniping location. In the mission there was a shot down helicopter. To the west will be a strip of the road going down. Go straight ahead. On the front left side is a door. Enter it and go up the stairs to the end of the building. You should be looking out a third story window.
Usually when you kill every enemy except for one, he will either shoot his gun straight up, or shoot a wall. If you wait about two minutes, about three or four more people will appear. When they shoot the wall or straight up into the sky, they are actually calling for backup. When another soldier far away hears a gun firing, they will run towards it to aid their friends. If you find a group of people and they all are killed except for one, and he begins to sprint away, it is imperative that you catch and eliminate him immediately before it is too late.
Leave Bravo at the insertion/extraction point. Take Alpha and secure the crossroads and rescue the soldiers in the buildings. Make sure you only have one soldier remaining (kill the other two if needed). Go back down the road where about five soldiers are waiting. Let them kill you. If done correctly you should have a mission complete.
When playing in multi-player mode, find the large building with a Russian flag flying in front of it. Go through the gate and take a right, then a left, then another left, then turn around. There will be a stairway. Go up it into the building and go up those stairs. Take the first left and you will find a very nice sniping location.
When you meet up with the allied tank go forward. The first building on the left will have several soldiers in it. One man has an anti-tank rocket. Eliminate him as soon has possible to stop him from destroying the allied tank.
- Purple Heart: Get wounded or killed in action
- Bronze Star: Get 15 kills
- Silver Star: Get 20 kills
- Distinguished Service Cross: Get 25 kills
- Congressional Medal Of Honor: Get 30 kills
- Bronze Star: Get 15 kills