Need for Speed: Hot Pursuit
73 Achievements
30-39h
PS3
Wanted
Reach wanted level (14) Wanted as a Racer
13.7%
How to unlock the Wanted achievement in Need for Speed: Hot Pursuit - Definitive Guide
You should be able to get this via normal story progression. By the time you have finished all of the races as a fugitive you should be around level 12-14. If you aren't then I suggest you go for the gold digger achievement, which should get you to roughly level 17. Netting you this achievement.
You will need to reach rank 14 as a racer with a total of 1,130,000bounty points to get this trophy. Please see Most Wanted on how to get points and some of the better ways to level up.