Ace Combat: Assault Horizon

Load up the Mission Inferno, free play or campaign, after you kill the first few bad guys a friendly pilot will ask you for some help because he is fighting some bandits over the oil field and there giving him a hard time, there will be about 4-5 Mig 21 Ace’s, what you want to do is quickly kill the aces and when there is one left, the game will teach you how to do a Counter Maneuver, it will pause the game and it will tell you that your enemies can also use counters and that when they do there will be triangle that flashes red on your screen whenever you see that you push LB and RB at the same time this will make your plane, counter his counter and leave him open to an attack, the great thing is the game pause and to continue all you have to do is push LB and RB, It also tells you to push A after you do the counter this will kill the enemy plane, once this is done pause your game and reload check point, do this 2 more time and the achievement is your, And yes this is cumulative.

This Achievement want you to do an counter counter.
Means: If you are in DogFightMode and the enemy activates an Counter Maneuver you have to counter the Counter Maneuver by hitting LB and RB while a red mark flashes in the middle of the screen.
If you have problems getting this during normal gameplay try doing it on the Mission Inferno (the one on the Oilfields).
After some time one Mig 21 Ace will do an Counter Maneuver as part of an Tutorial Message. (The timing is easy because the game stops)
On higher difficultys the enemys use this move more frequently or the two Aces at the end of the game but its increndible annoying to counter the Russian PAK Aircraft because of the chaos and omnipresent missile warnings ;)