Easiest way to obtain this is to ask some help from a friend, setup a co-op game longest daycycle. Start up as allies. Look for/craft a decent melee weapon. Ask your friend to craft a bedroll, and set it up next to you. Go and unfriend, then just wield the weapon and macro away the swings while your friend does the same for spawning at the bedroll. If optimized this will also count towards the 500 death achievement and will take a couple of hours for you both to get the achievement.