My Night Job

This one is a little tricky as you can only bring along 10 regular survivors at a time before they start staying behind when you find new ones. Special survivors, on the the other hand, stay with you regardless and only leave if you leave them behind by going too far ahead and they get caught by enemies. For that reason, I would use one of them for this trophy.

After you have one, just make your way around the entire house in to every room with them, making sure to kill enemies and keep them safe as if they die, then you have to start the tour all over again with a new one. Once you make it through the entire house with one survivor, the trophy will pop.