When applying for a higher education job, do I need to list my bachelors? If I did a bachelors a long time ago in an unrelated field and I am applying for a job that requires a PhD And a Master's should I put the bachelor's degree? Is it necessary?
Yes.  An academic CV should list every academic degree that you have earned.

If you don't list it, it will look as though you got a PhD without ever getting a bachelor's degree at all, which would be very strange and perhaps suspicious.