Operation Flashpoint: Dragon Rising

After destroying the two AAA vehicles, make sure first to run to the check point, then board the helo as the pilot (not co-pilot!)
fly to each check point in the air and after 4 or 5 there will be a purple smoke marker. Gently glide down for a soft landing near the smoke to unlock this achievement.

edit: This can be done as the co-pilot & instructing your pilot where to go.

Shortly after starting the mission you will be tasked with assaulting a small village to destroy two AAA tank positions before two trident vehicles arrive. After you have killed all the troops plus these two AAA tanks two choppers will land a little past the village. You will then have to fly one of these helicopter to the designated place on the map. To make this easier for you there will also be four purple tracer smokes displaying the landing zone. Once you have landed the helicopter the achievement should pop instantly.

To further help you with this achievement watch this youtube video to show you where to fly the helicopter.

All credit goes to NARuthless