Before starting, make sure you have as many Com Jams as possible, and the resources to craft more if necessary.
For this achievement, you need your wanted level to get to 5 BEFORE the cops are notified of your crimes. Keep in mind that if you escape a Level 3 scan/pursuit, your wanted level will stay at 3, even though they have stopped looking for you.
Go to a busy intersection, or highway, and have a fast car handy nearby. Also, a good assault rifle will help out. Start killing civilians, and make sure that you immediately kill any civilians that begin to call the cops, shown by a red triangle symbol above their heads.
The goal is to get the white bar under the map to Level 5, and as soon as it does, get in your car and speed off. Once a caller connects, the bar will turn yellow, and large circles will appear on your map with a percentage. Stay out of the circles to keep the percentage down, and if you are getting close to 80%+, use a Com Jam to interfere with the scans.
Keep running until they call off the scan and the trophy will unlock.
Note: If a caller connects before Level 5, make sure you escape that scan, and then repeat the process.