There is an easy way to find ALL SAP HR Tables in the system. Any SAP object is assigned to so-called Package. Once we know the package name we can list all objects inside of it. If you’re curious enough you can find a lot of interesting tables, views and moreover programs which are not listed anywhere in official sources.
Open SE80 transaction, choose ‘Repository Browser’ on the left side. Then choose ‘Package’ in the dropdown list below and enter ‘HR’. Hit ‘Enter’ and you’ll see all packages and subpackages in a hierarchy. Expand whichever you want to the lower level and you’ll find everything there.