Make sure to kill all enemies! Doesn't matter what weapon you use, as long as they die!
* Room A.
* Room F.
* Kitchen.
* Lab A(spawns after activating the generator).
* Lab B.
* On the roof(when climbing up to get the wires/cable from the radio antenna).
* In the corridor outside the garage and Lab B.
* Inside the garage.
* Inside the shed.
* Dog outside near shed.
* Dog outside near generator.
* Dog outside near starting hut(spawns after you've got the code for the weapons locker with the shotgun).
* The boss.