The easiest way to get this by far is with boosting.
Start up a game with a score of 10 with the score system to kills only. Now one of the best plane to choose for this would be the Fire Dragon due to the amount of missiles it has. The person dying should choose the Shooting star due to the low armour rating. Now if the person who is going to die pulls back on their right stick to slow their plane right down it leads them to be a sitting target for a missile attack from the attacker.
Do this 5 times in a row and the achievement will unlock.
Be careful if your shooting head on not to collide otherwise you will die and have to try again on another round.
You can get this and Immortal (10 Kills without dying) in the same game.