Mercenaries

Collect the certain number of blueprints to unlock the reward.

Accept Gimme the Money mission, its unlocked right after you meet with each faction for the first time, at the Mafia HQ. Now you can either cancel the contract and recieve the helicopter tight on the roof of the Mafia HQ or complete the mission and return the helicopter but as soon as you exit the helicopter jump straight back in so the mission finishes but you still have the helicopter

This is a 100% glitch that works everytime. All you have to do is, select something from the buy that you want, throw the grenade and just before the grenade hits the ground quickly go back to the shop select and choose anything else and select it. Then when you get back into the game with the new selected item the old one will be droped free of charge!

At any time during the game when you have a vehicle that needs repairing or more ammo you can get both for free by doing a mission and canceling the contract. All you need to do is park the vehicle in the base where the mission is, accept the contract, and then cancel the contract. You’ll get the retry screen, select no, and then your vehicle is fully repaired and rearmed without losing money. You can then do the same mission at a later time.

While taking face card contracts (Jacks, Queens and Kings) different actions within the HQs that is giving you the contract will become available. These actions will present themselves as you walk around inside the HQs, you will be prompted with ; Y' (just like sitting or getting up from the chair). These actions become available only after the initial dialog is finished though, so sit tight for a minute then search around.

Some of these actions include: pouring a cup of coffee(AN), spinning around on a chair (SK), picking up a missile, going to the bar and get a drink(Mafia), typing on the keyboard(Chinese), tapping on the missiles(SK)...etc...

Also, some funny dialog may ensue.

To have Jennifer Mui wear her backpack from her first costume while in her second costume, start in her first costume (with backpack) and use a skin cheat (ex. Han Solo, Mafia Heavy, etc.) Now go to the Allied MASH in the second province and change costumes. Jennifer will now have her back pack attached to her second costume. To undo this change in the first costume the back into the second.

Destroy the certain number of Monuments to unlock the reward.

Enter this code on the Factions screen in your PDA. (The costume codes do not work until the correct amount of National Treasure/Blueprints have been found.)

To get a free refill of your vehicles health and ammo simply exit the vehicle and walk away from it until you cannot see it anymore. Now, head back to the vehicle and it should be fully repaired and re-armed.