You can obtain this achievement in
Mission 3 of the Trouble With Clones DLC,
'Send in the Clones'.
Near the start of the mission, Jimmy will give you the ability to use super powers from his special brew of Saints Flow.
As well as the ability to run fast (LB) and super punch (RT), you will also have the ability to shoot fireballs (RB). Progress through the mission by following the markers and you will eventually see an enemy helicopter. Aim and press RB to shoot the fireball. One fireball should take it down and unlock the achievement.
If for some reason you do not manage to unlock the achievement, you can simply replay the missions again after completing the DLC. To do this, save your game, and then reload it. Access the Missions menu on your Cell Phone for the option to replay the Trouble With Clones DLC again.
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