Mafia 3 – Recruited to 5th SFG Trophy / Achievement Guide – Performed 5 headshots in 5 seconds [Bronze / 15G]
The perfect spot for this is at French Ward police station. There are many cops close together. Hide behind a wall or car and throw a “Screaming Zemi” in the garage where 3 cops are standing. It will lure all the cops from the police station. Now they will all stand around the Screaming Zemi to investigate. Take out your gun (Pistols & Rifles work best) and quickly shoot them in the head.
If you mess up, let them kill you! You will respawn in a nearby safehouse.
The Screaming Zemi is unlocked after beating the first Racket Boss, very early in the game. You can buy it at any time from the Arms Dealer (who you can call via the weapon wheel).
Thanks for your vid!
It helped me getting this trophy!