Missions A-2 to A-4:
Beat mission A-1.

Missions A-4 to A-7:
Beat mission A-4.

Missions A-7 to A-10:
Beat mission A-7.

Missions B-2 to B-4:
Beat mission B-1.

Missions B-4 to B-7:
Beat mission B-4.

Dragon-SPL Car:
Beat mission A-1.

Super Car:
Beat mission B-1.

Tank-90:
Beat mission B-8.

Tiger-SPL:
Beat mission A-8.

AUV:
Beat mission A-9.

Monster Find:
In B scenario on the mission where you have to wreck all the Dim Sum stands in a limited time, if you get to the question mark (monster truck) before completing the mission you will be abale to find the Monster Truck. To get to the truck, go down the street a bit (where the question mark is) and there is a wooden jump.Goabout 65-80 mph jump straight off of it. You won't be able to see much because of the explosions but you will land on a platform that will lead to a showroom type area where the mighty monster truck lies. run into it and quickly complete the mission to get it.

How to Get the Police Truck:
In mission A-4, after hitting the dump truck 2 times, cut through the turn and make a right around the right curve. Jump by pumping the gas at approximately 30 mph. Go up the platform and fall through the hole, the police truck must be in the ditch, go on the side, turn, and hit it with the side of your car. After hitting the truck, quickly speed off and look on your left side,you will see a ramp, go over it, turn right onto the platform and activate the elevator.

Thanks to Revolution readers Rgdawg, John Goodrich and Matty Bones!