**This achievement is MISSABLE**
When the feds throw flashbang-grenades, the grenade will say some "beep"-sounds and flash red.
Shoot or melee-hit it before it explodes.
Do this 30 times.
NOTE:
When succesfully destroyed, it will blast some sparks and stop beeping and flashing red. - after this, it wil disappear and you will not be flashed.