Rollerdrome

I got this achievement when I hit 55 challenges completed in the main campaign. It pops mid-match when you complete your 55th challenge.

To complete the challenges, I would recommend using the Assists for invincibility, infinite ammo, infinite reflex time, and easy slug shots in the settings menu. You can also turn down the game speed which should also help with everything as this game's movement is very fast at 100% speed.