What was Hades greatest achievement?

Hades' greatest achievement is often considered to be his successful management of the Underworld, ensuring that souls were properly judged and assigned their afterlife destinations. He maintained balance in the realm of the dead, preventing chaos from spilling into the world of the living. Additionally, his role in the myth of Persephone demonstrated his ability to influence the seasons and the cycle of life and death, showcasing both his power and complexity as a deity.