Touchdown

No, Buddha realization is not the highest possible achievement for a human being.

Realization of the Highest Truth is just the path we undertake to know the Way of this world and self, reality. To be able to take that realization and help another, truly help them, is the highest achievement that you will ever be able to accomplish in this world. It can also be the most difficult and the most gratifying thing that you will ever do.

With many blessings.