Send a Helicopter's rockets back at it using any Blast ability.
Your first opportunity to earn this is during the story mission, “Bertran Takes the Stage”. Near the end of the mission you’ll be chased by a helicopter which you must take down in order to progress. Damage it by shooting lightning at it like any other enemy, and eventually, one of its engines will blow up. It will then laser target you, and then shoot two homing rockets at you. Perform a Shockwave Blast(+) just before the missiles hit you and they'll switch directions and head back to the helicopter. If the missiles connect, you'll not only damage it but also unlock your trophy.
If you missed this opportunity, there are several more opportunities where you will be facing a helicopter such as powered down areas where you can find them patrolling the area.
this is easiest in the side mission heavy weapons first defeat the monsters when they apear next climb on top of the tall octagon shaped building attract the helicopter wait for it to show you a red line the rockets will appear letting you blast them to get the trophy
You can pull this off at any time from a fairly early point in the game by venturing into Ascension Parish before the power is restored there. If you're near center of the map in that area (just east of the cemetery, near the "town square"), a helicopter should spawn there over and over again. You can use the blast ability that you get pretty early in the main story to send the rockets flying back at the helicopter. No upgrades are necessary.