Watch Dogs

These missions will appear when you finish act 1-2 Fading Signal. Open your map, and press LB/RB to go to the online contracts. Go to the top right and select the Street Sweep Sweep online missions.

Once you find someone, both go to one of the orange icon missions on the map. You can play any Fixer, South Chicago and Militia contracts while in co-op, so you can work in these achievements.