The MercenaryG 10

This achievement is unlocked by killing one of the freak zombie types called Juggernauts. These zombie types will do massive damage to all vehicles. The best way to kill them is with multiple Molotov cocktails and firearms from a distance as they will charge at you very quickly. You will want to clear out any other zombies in the area before a Juggernaut fight. Then you can side step their charge, put some distance between them, and unleash another barrage. These zombie types will roam anywhere in the game world. You can also climb a cell tower to survey the surround area. This will help find and identify freak zombies from long distances. Kill five of these Juggernaut zombies in a Breakdown level 5 or higher game and the achievement will be yours.