The earliest you can attempt this achievement is after the "Friends Reunited" story mission, as this is when all three characters will be available to use within the game. Open up your cellphone, go to "Contacts" and call either one of your partners requesting to hangout. Sometimes your partners may not always be available to hangout because they are sleeping, have an immediate story mission that needs to be completed, or you just did a mission with them. Just keep making calls during your time off-mission until they both are available to hangout.
Once you've requested to hangout with either one, a new stickman icon will appear on your map. This is the location of the person you have just called. Head there, pick them up and then call the other character. Make sure you have a four-door car when picking them up!
Now in order to obtain a 3 Star Wanted level, you will need to either kill a police officer or trespass an airport. Both of these methods will get you 3 Stars right away, however it is recommended to trespass the airport as you can simply drive laps around the immediate area until three minutes have passed. It is also highly recommended to use a car in which you have bought bulletproof tires. Once three minutes have elapsed during the chase, the achievement will unlock. For further explanation on how the Wanted Levels work, CLICK HERE.