Pedal to the Metal Trophy in Skylanders Giants
Pedal to the Metal
Chapter 14 - Collect all 16 speed boosts in "The Long Haul" section
How to unlock Pedal to the Metal
After the third area that you have to solve puzzles in is the long hall area, make sure to collect every boost power-up that you see. As long as you follow the path that is marked with coins you will easily be able to get all 16 speed boosts. I recommend not using any boost in this area, as you will fly slower and it will be easier to control your jet. There is also a counter on the side of the screen that will tell you how many boosts out of sixteen that you have collected. When the counter displays 16/16, the trophy will unlock.