What classes am I going to have to take in college to become a Criminological Psychologist?

You do not have to major in psychology. In fact, since you’ll need a graduate degree (MA) in Criminological (or “Forensic”) Psychology, I would recommend against making that your undergrad major too. You would be better off majoring in sociology, where you should be able to learn more both about the criminal justice system and about the populations you will likely be working with. Jetc’s suggestion that you do relevant volunteer work is good.

I am curious why you would advise someone against majoring in psychology in their undergrad. For one thing, it helps to get into grad school if you already have a psychology background, schools actually look for that when you’re applying for your masters, and for another, it is extremely difficult to catch up (not impossible, but difficult) because they’re going to assume you already have a background in psychology. Which means you have to do all the leg work on your own. I would know because I spent a lot of time helping out a friend who majored in religion and she didnt know basic terminology and would sit clueless in some of our classes while i was doing my masters

You’d take psychology, anthropology, sociology and criminal justice classes. Oh, and you realize that in order to have a title of psychologist in the U.S. you need a doctorate (a PhD or a PsyD). With a masters you’d have a masters in forensic psychology, you aren’t a psychologist. To get into a masters program, you’d look up the requirements. To get into a PhD program, you’re also going to have to take a few research classes in psychology and a statistics course.