Full Auto

The Speed Kills series is unlocked after completing the Fine Balance series (which is unlocked after completing the Tough Guys series). There are seven races to complete, and all involve A-class vehicles.

You need to meet the Survivor requirements for all seven races to earn this Achievement. Pay attention to the individual race requirements and try for the Gold while you're at it, since there's an Achievement to earn for getting a Gold (Full Auto) medal on all races.

Once you pass the requirements for all seven races, the Achievement will unlock.

I recommend using the shotgun/grenade loadout. The shotgun does more damage on a single hit, and can be aimed using the Right Analog Stick so you can stay out of the line of fire from your opponents' rear-firing weapons. When dropping grenades, either wait for an opponent to get right behind you so that you can hit him with all four, or drift from one side of the track to the other so that you lay a strip right across the road that is harder to avoid. Also, execute hand-brake turns with the X button as much as you can, to keep your boost meter replenishing faster.