Tom Clancy's H.A.W.X. 2

This is a lot easier than it sounds, in fact, I got it on my very first ever shot in Survival mode. What I did was start a survival mode game on my own, from the main menu selecting 'Missions' and then 'Survival'. I selected a plane with Multiple missiles, I then started the Moscow map. The first wave involves 4 planes flying straight at you, and they aren't very clever at all. Just take aim and fire when all 4 targets are lit up. This resulted in 3 kills for me, without even trying. There are probably even many more ways of achieving this.