Kung Fu Rider

This trophy is earned when your boost bar at the top of the screen starts empty and maxes out within 10 seconds. Sounds hard but it's easy. Any area with a bunch of power dash grids in a row, grind rails, and/or groups of mobsters to hit will work. One mission to get this trophy is at the beginning of the Project Bayside Revenge! mission. The timer will be around 128secs when you hit the first Power Dash Grid. Stay between the cars until the car on the right passes you and then grind on the rails to the right. While sliding, duck under the branch by pressing the button and continue to grind. When you kick the first mobster at around 120secs or 119secs, your bar should be maxed.