(adsbygoogle = window.adsbygoogle || []).push({}); I killed all of them the respawners and no trophy any idea
searching all room
i do it under easy mode

Thank you guys finally i got it
couple time than i got it
i must do it step by step
1.Basement First Floor - 4 Zombies to kill
2.Training Facility First Floor - 2 Zombies to kill
3.Basement Second Floor - 5 Zombies to kill
4.Basement Third Floor - 1 Cockroach to kill
5.Training Facility Second Floor - 4 Zombies to kill
6.Training Facility Second Floor - 3 Zombies to Kill
7.Training Facility Second Floor - 3 Zombies to Kill
must be tougher Rebecca and billy