Mission 16 - Severed Ties
Il be honest here. I really do not understand this achievement description BUT the achievement unlocks.
At the beginning of the mission you will be in a tank. And after proceeding on you will encounter a large array of satellite dishes and have to deal with 6 or so tanks.
Your team-mate will call out to tell you helicopters are in-coming. You can see the red dot at the top of your screen. And I believe they are in groups of 3, hence the 3/3 kills needed for the achievement. Change weapon by pressing Y. To fire use RT and guide the missile, You can detonate at any time by pressing RT again.
In the video I take out the first group of 3, but it doesn't unlock until i take out 1 from the second group of 3? But just keep destroying the Helicopters until the achievement pops.
I apologise for not being able to write this better, Please if you understand this achievement let me know :)