The description on the achievement is pretty much self explanatory...Get 3 stars on all Tier 3 events.
Events:
Take Out The Trash - Interceptor
Martial Law - Tough Justice
Pedal Meddler - Power Struggle
Clock On - Rapid Response
Taking Liberties - Interceptor
Prosecution Unrest - Power Struggle
Tier 3 was the first tier to give me difficulty in obtaining 3 stars. In particular, Clock On was by far the toughest event for me. I probably played Clock On 50+ times before I got the final star.
I was finally able to get Clock On with the Bugatti Veyron, even after trying several times with the Lamborghini Reventon.
Tips:
- Learn the track, anticipate the severity of the turns. Use environmental markers to help with your timing on the turns.
- When possible, come into a turn from the outside, turning to the inside of the curve. Using this technique seems to cause the least amount of skid, and therefore the least amount speed reduction around the turns.
- On hard turns slow down a little to avoid crashing and bumping the edges which severely reduces speed.
There are only about 3-4 events in the entire Cop career that seemed difficult to obtain 3 stars. Good luck.