Members Only (Getaway)
First, you have to escape the pursuers by all means necessary. Don't bother attacking them since they'll just respawn infinitely. Once you lost them, head to the delivery point without being detected.
Hard Shoulder (Interception)
You have to pursue the target while dealing with enemy vehicles as well. After cornering him, kill the target to complete the mission. You have to deal with his reinforcements as well or escape them.
Grand Triathlon (Transporter)
First, ride the bike to the first drop off point. You can set the waypoint and just follow the main road until you reach the marina. Next, ride the speedboat and deliver it to the next drop off point. Once you reached the last car, deliver it to the parking lot as fast as you can, in the best condition you can manage to complete the mission.
Connection Interrupted (Interception)
There are two targets you need to pursue and download the data from. The quickest way to recovery the data is by forcing them off their vehicle and killing them. The first target will call in reinforcements so you have to deal with them as well before heading to the second target. The second target is alone so taking him down will be much easier.