** 01/30/2014 PATCH FIXED THIS ACHIEVEMENT
Looks like this achievement is obtainable now after the latest patch!
Easiest way to get this is to get three friends in an empty server and land an attack helicopter somewhere. Have the other team put down a spawn beacon and keep killing till you get the cheevo. Once both people on your team have it, hop out of the helicopter and put down a spawn beacon. Then let the other team shoot you and everyone gets it.
This achievement is glitched currently. I even tested on an empty server with 3 friends and set it up to confirm (4 people starts a match). Tried it with gunner seat and pilot seat on Gulf of Oman with attack chopper, no achievement.