This is actually a pretty easy achievement, but it requires you to collect vehicle mods.
Once you get at least three vehicle mods in ONE particular category like Performance Mods, Horn, or Specialty Mods, go see the Shark Mechanics in the Academy where you upgrade your vehicles.
I used Hot Streak's Specialty Mods. Simply use LS you toggle through the Mods. I have Blaze Boosters, Block Broiler and Wind Flares.