1.) D License - after finishing, wait until a squirrel falls on you.
2.) Titans Graveyard - about halfway through the track, there is a big drop off. Slow done and drop to the flat rocks, then reverse of the ledge.
3.) Strike - early in the track, you can drop between 2 buildings and enter an open door.
4.) Cliff Jumper - drive off the first platform, then drop off the next section and allow your bike to roll backwards.
5.) Harbor Havok - a little over halfway through the track, there is an open shipping container you can back into.
6.) Power Plant - back up after elevator ride and bail into water below.
7.) Rock Steady - hit barrels at the finish and wait about 15 secs.
8.) Sunset Stripped - reverse into the fence at the start to cause a firework to lauch. Then continue on and you will end up on a roof . Just drop into the open container.
9.) Around the Ranch - all the way at the end, at the final jump, take the lower ramp and drop all the way to the bottom. Reverse as far as you can when on ground level, the outhouse will explode and you will get one.
10.) Meltdown - reverse until you hit the fire and then complete the track without dying and you will see it at the ending.
11.) Physics Factory - Bounce off the spring pad backwards or drop down from lower level pipe (There are 2 explosive barrels on the platform you need to land on, still unsure how i managed to make them explode before i landed) keep reversing into the now open doors and you get eaten by a box, then squirrels pop out of the wall.
12.) Sewage Plant - Bail out onto the first water jet and launch yourself onto the rooftop with a glass section. You need to wiggle your guy to the left and have him drop into the squirrel room below.