The only trap Jason has is Bear Traps, so the only way to trap a Counselor is to but a Bear Trap down by pressing your RB button and having a Counselor walk/run over it repeat 12 more times and the achievement will unlock. One good way to get this is put a tarp outside a window of a building someone is in, as they tend to lock the doors and when Jason gets in the building they jump out the windows.