Get Obstacle Course
Use stunt mode and get 1 million points

Get Stunt Track 2
Use stunt mode to get 100,000 points

Get Stunt Track 3
Use stunt mode to get 200,000 points

Get Venom Vehicle
Use stunt mode and get all silver coins

Get Battle Mode track 5
Use battle mode and get 100 kills

Get Battle Mode track 6
Use battle mode and get 250 kills