One Man Army
If you're having trouble getting this achievement there's a really easy way to get it. Just call up Brucie and go on a Heli Ride with him but instead of going to the destination, fly over to Aldernany and get 6 stars. Then just fly around for 5 mins. I only had 2 police choppers come after me the whole time and I could constantly out run them.
I wish this achievement was harder to get.