Originally Posted by JuSt BLaZe
I did that in the "Birdie's gift" mission at the shooting range. Kill 'em all, get your Silverballers, exit out. Rinse and repeat three times, Achievement unlocked.
But yours is also fine, just takes a lil longer.
your way is a lot better.
i also thought you had to complete your current mission for the headshots to count, but apparently not, then.