What does Pluto in Scorpio in the tenth house mean?

Pluto in Scorpio in tenth house can mean a variety of things.

Its influence is of the greatest importance if Pluto was in MC (zenith).

You may become the manager of an industry, or an occultist (apocryphist).

Hereditary traits/patterns will be of great importance in your life.

Unseen forces are influencing your career.

The gravity by which Pluto's affecting your tenth house area (your achievements), is a resultant of your whole horoscope. I suggest you to look for some major aspects involving Pluto. This mere element (Pluto in Scorpio in house X) can't be very distinctive.