Student put my name in the acknowledgement section despite the fact I have never talked to him
Move on. There is little you can do about it: People can claim whatever they like on the internet and if they say that you worked with them, that's a nuisance but there is little you can do about it (in most jurisdictions) as long as they do so on websites that do not have strong ethics. academia.edu is not one of those websites with strong ethics.
Continue to do good work and build a reputation for yourself through your own publications. That's what you should focus on. The likelihood that anyone will find the pyramids publication is pretty small, and in the worst case if someone asks you about it, you can always explain the story (or just say that that must be someone else with the same name as you).