5 Buster Achievement in Need for Speed: Rivals
Bust a Racer at Heat 5 or greater
How to unlock 5 Buster
Story related, cannot be missed.
As you progress through your cop career the heat levels of the racers you bust during the Interceptor and Hot Pursuit events will increase. As will the heat levels of the random racers you see driving around. As soon as you bust a racer with heat 5 or higher the achievement will unlock.
This will likely be the first achievement you unlock during your cop career.