In the very last mission, where you have to kill Jericho, quickly duck behind the dumpster. Then, go into first person mode, have a michine gun ready, and you should be able to shoot through the dumpster, but he can't shoot at you. This is useful, since it takes a long time to kill him and you usually die.
Kill all 10 Timmy Vercellis in Miami. Go to the Miami armory to the "18 Wheeler Havoc" option.
Fugitive Mode
Kill all 10 Timmy Vercellis in Nice. Go to the Miami armory to the "Fugitive Mode" option. All pedestrians have weapons in this mode.
Go-Kart in Miami
Find the hidden bunker entrance in the bushes behind the Biltmore hotel. Climb the stairs, kill Timmy Vercelli, then hit the switch to open the gate below. Drive through the tunnel to the Go-Kart track. If the kart isn't there, leave and return later
Infinite Mass
Kill all 10 Timmy Vercellis in Istanbul. Go to the Istanbul armory to the "Infinite Mass" option. Tanner's car or motorcycle can hit any other vehicle without stopping or being damaged in this mode.
Find the garages and get in the cars in Take a Ride Mode.
Unlockable
How to Unlock
Ford GT-40
In garage of last house on road to the side of the middle bridge. (The short dead end road)
Fork Lift
In Nice, near Rade De Villegranche-Sur-Mer there is a mitten-shaped area and a finger-shaped area. Find the road at the finger that is not on the map, continue until you are on a dirt road that leads to a garage.
Hot Rod
Go to the firestation at the airport in Nice located past the runway on the side closest to the roads. In a garage is the car.
Racer GT (Istanbul)
Go to the industrial docks and it will be in a red crate.
Roadster (Istanbul)
Go to the impound lot, it will be in a garage.
Speedster (Istanbul)
Go to the train yard in the southern section of the city. It will be in a building behind a crate.
Velocity Turbo (Miami)
Go to Tico's construction yard. Southeast of that will be a building and on the southern half will be an alley. Down the alley will be the car.
VW Van
Go to the spot on the map where there are two roads in a circle. There is a small hill with small streets going up. Drive to the top of the hill and go down the ramp. Open the grey/black garage door to the right of the ramp.