Hello Tech,
That's actually a fairly tricky question. You can access the website and then click throughlinks that are available through the website interface that lead to different pages. However there's also the possibility of pages existing on your website that do not have links. So, it's a little difficult to give you a straightforward answer. If you have a good sitemap, you may also get a good idea of your website's structure and pages. Checkout XML Site Maps for more information.
Hope that helps!
Regards,
Arnel C.