HOT WHEELS UNLEASHED

There are five boss races in the base game of HWU, and the DLC's have no boss races as of this post. Boss games are represented by red, fire tokens like the one in the icon for this achievement. They also walk, talk and act very similar to normal racing events.

The earliest/easiest boss race I came across is seven spaces from where you start (the green star), and is called Ex Machina. Complete the events along the way as you go -- but from start it is Up x 3, Right x 2, Up x 2.