Kill 3 zombies with a propane tank explosion
State of Decay THE BRUCE Achievement Guide – Kill 3 zombies with propane tank
Propane tanks can be found mostly in towns across the map. Near the starting base (church) you can find one behind a gun shop. Make noise to attract some zombies and lure them to the propane tank.
Once you get some to follow you to the back, they are forced to stay close to the tank because the wall of the gun shop is blocking the way. Shoot it and you should get at least 3 since they are so close together.