Complete the indicated task to unlock the given Shield.

Shield	How to unlock
Concepts Shield	Win all Concepts Challenges on any difficulty.
Generations Shield	Win all Generations Challenges on any difficulty.
GT Shield	Win all GT Challenges on any difficulty.
Mustangs Shield	Win all Mustangs Challenges on any difficulty.
SVT Shield	Win all SVT Challenges on any difficulty.
Thunderbirds Shield	Win all Thunderbirds Challenges on any difficulty.
Trucks Shield	Win all Trucks Challenges on any difficulty.