Completing the game 100% requires you to do unique stunts, and it is therefore important to take note of the stunts you have completed so that you know later on which ones you have already done. The best mode of transport to use to do stunts is the PCJ 600. You are an incredible player if you can make some of those stunts using a bus, a Faggio or a trashmaster.
There are different stunts you can do with the bikes. One is a wheelie. To do a wheelie, you need to pull back slightly and accelerate suddenly. When the wheel comes off the ground, you can pump some gas to sustain the stunt. You can get a cash bonus if you can keep it up long enough. You can use the wheelie to launch the bike over walls.
The other stunt you can do is a stoppie. This happens to be the opposite of a wheelie. To do this, you shift your weight forward, and this should take the back wheel off the ground. Then, you can press the brake. This will cause you to slide forward.
Revving up can be done by holding down reverse and forward simultaneously before launching. You can now release the reverse motion and it will launch you forward. This allows you to switch gears earlier and pick up speed faster.
Crouching
Crouching is a vital motion that helps you in many ways. First it makes you a much harder target to hit. The other thing crouching helps with is to make your aim steadier. It also allows you to take cover behind obstacles like a wall or barrel.
Vantage points
It is wise to always have the advantage of elevation in any confrontation. Of course, this applies to places where it is possible to do this. Being at a greater height than your adversaries gives you an advantage, especially if you are in an enclosed area and the enemies are confined there in. Anytime you are in a building, ensure that you survey the vantage points when you get the chance.
Running
This is a basic movement that allows you to escape from attackers. The advantage of this is that it distorts the accuracy of the ones shooting at you. You become a much harder target to hit. If you can, use a vehicle to escape. In the vehicle, you can take up a lot of gunfire as compared to when you are on foot.