I am in the house and I have one last objective to kill a spider using a book. I have picked up a stack of books from the shelf as there is no way to pick them up individually and I’ve hit a bunch of spiders but the goal is not unlocking. Are you supposed to do this in some specific way?
Make sure the spider is actually dead. They can take a few blows from the book before actually dying from it. You might have injured them and caused a splat but not actually killed it. Keep thowing the stack of books until you get the kill