This achievement is earned during Act 1, when you have to defend against some zombies in the woods near the school. There will be 4 traps for you to use to help clear them and you want to use all 4 traps to unlock this. The following missable achievement can be seen in the video below at 0:58
If this is missed, players will need to restart the episode from the beginning. It is advised that you back out to the main menu, and copy your saves manually every once in a while just in case to allow for an easier mop-up.