Legend of the Guardians: The Owls of Ga'hoole

To perform a team attack combo, you need to first send a wingman to combat an enemy by targeting the enemy with . Next, send a wingman to him by pressing . Finally, keep this enemy targeted and go help your wingman by attacking the enemy. There will be a notification on your screen if you've done a team attack. As long as you're using your wingmen throughout the game to assist you and as long as you're fighting along side them, this trophy should come naturally.