Run around the map and only shoot zombies when they can hit you. This can be done with the pistol. The zombies will not get more health, as in Defense mode. Four shots with the pistol is enough to take one down. After a certain number of zombies appear, no more will spawn. When the zombies are following you in a large crowd, all of them will want to travel in the same direction towards you. This allows you to simply kite them around the map. If a zombie does get behind you, it is better to shoot him once he gets in a dangerous position where he can hit you. It is better not to kill a zombie, as another one will spawn somewhere on the map when one is killed, which makes things more dangerous. Kite them around the map as long as needed to get the "Beginner", "Survivor", and "Veteran" and achievements.Easy "Kiting Mastery" achievement
Walk in large circles around the lantern and try to maintain good accuracy. After four or five nights, you will have enough money for the Tesla. After five or six nights you will have enough money for the Laser. Purchase the one you prefer, but do not buy any other weapons in order to always have enough ammo from the crates that drop. If a zombie drops health that is needed, walk in a small circle and shoot your way through to pick it up.Easy "One Shot, Many Kills" achievement
Create a set of long parallel wooden palisades either horizontally or vertically to force a number of zombies to line up. Kite them around to an angle at which you can hit at least eight of them with a single shot. Note: Zombies killed while off-screen will also qualify.
Walk around in circles to get a swarm of zombies, then fire a lucky shot into the middle of the crowd.