easiest way to get "alone at the end of the world" (outdated) 

just go to a house in hougoumont near the fire and sit in that corner. sit in that position so that the bomber have a lesser chance of entering the house and the shamblers and zappers won't hit you. use barricade to reduce the bomb dmg or lure the zombie into one side to kill them with your axe without moving.
use siege armour incase there are many bombers. kill the runners as soon as possible before they enter the house and give you a headache good luck :)