Cannonball!: Do a cannonball from the diving board
When you get to the pool, land on the diving board then bailout.
Get into a cannonball pose by holding the left trigger before you hit the water.
Pyromaniac: Finish the track whilst on fire
Back up onto the flame when you begin the track and set yourself on fire, then complete the track without hitting the water or faulting. You also need to keep moving or your bike will fall apart.
The biggest challenge is getting over the first water jump - aim to drop into a wheelie from the ledge then get enough speed to bunny hop over the pool, before bunny hopping again from the next ramp onto the roof of the hut. Provided you're familiar with the track, the rest should be simple once this obstacle is cleared.
Waterproofing Test: Introduce electricity to water and get yourself electrocuted
As you approach the end of the track, land on the plane engine hanging by vines then wait on top of it.
A few seconds later it'll lower down to the water and you'll receive a blast of electricity.
Shocking!: Get stuck by lightning
At the top of the final slope, bailout and fling yourself over the finish line to land on top of the roof.
As long as you land near the lightning rod, the camera will start panning out - wait for a few seconds and the lightning will strike.