Don't waste those games were 1 or 2 people don't join the game after a long loading screen or disconnect as soon as the game starts. Catch a person and let them free or wiggle off you. Soon enough the others will work out you want to farm otherwise everyone loses rank because of people disconnecting. If you're using Nurses Calling its pretty easy to see how far away you need to be from the injured survivor. Feels cheap but it's pretty easy to get the achievement this way-. If you're going to get it properly good luck its a right pain. Seen people suggesting Iridescent Head for the 1 shot Hatchets with Infantry Belt for the extra 2 Hatchets. This means you'll have 3 Hatchets that can 1 shot.