Instructions
Join any multiplayer match. The type of match, such as Capture the Flag or Free for All, does not matter for this challenge.
Run through the battlefield with any weapon. SMGs work well for this challenge, but you can use any weapon you prefer.
Kill enemies without holding down the "Aim" button. Simply fire your gun and aim by moving your character's body. Any kill you get while aiming down your gun's scope does not count as a hipfire kill.