Hi Guys
Here is my Solution for this Achievement.
At the "Bravo" Mission / Waypoint are 3 Pinger and all of these must you destroy for the Achievement.
I think, the easiest and fastest Way is over the Mortar Crew in the west of the Map. When you press the Startbutton and then right, you have a Map. The Coordinates are ca 3A when zoom out and 3B normally.
At First you must help the Crew but is quite easy, you need only kill 2 little Ceph Enemies.
After this you have 2 Mortarshoots "free" and every of this shoots destroy a Pinger instantly (Recruit Difficulty)
Well, yourself must destroy only 1 Pinger and i used "C4" on the Legs of a Pinger. "C4" can you found a litle away in front of the Mortar Crew.
If you destroy the Pinger, use your visor to target Lock the Pinger for the Mortar Crew.
Regards