Submitted by: David K.
Easy "Zombicide" achievement:
Start a private Zombie Survival mode game. Select the "Max Zombies" setting
for more targets. Choose the Battle Rifle and any other weapon of your choice
(shotgun, machine gun, and sniper rifle recommended). You must get a twenty
zombie kill streak to get the "Zombicide" achievement. This is only possible
if you kill zombies quickly between each other. Do not waste shots. You will
have enough time to reload between kills; do not waste time by killing a zombie
after a reload. Since the Battle Rifle fires in bursts, a head shot will usually
kill a zombie. Body shots will require two bursts. Always try to get head shots,
if possible. Use your secondary weapon if you run out of ammunition, which can
happen if you get too many body shots. Do not scope in with the Battle Rifle
because zombies can approach from multiple directions and your peripheral vision
will be narrowed. Grenade kills will not increment the counter. If you die, end
the game instead of respawning, and try again. The zombies will spawn too fast
and will overwhelm you.