Who is heros accomplishments include killing the snake haired Medusa and turning giant atlas to stone?

The hero you are referring to is Perseus, a figure from Greek mythology. His notable accomplishments include beheading the Gorgon Medusa, whose gaze could turn people to stone, and using her head as a weapon. Additionally, he is credited with turning the giant Atlas into stone by showing him the head of Medusa, thereby creating the Atlas Mountains. Perseus is celebrated as a quintessential hero in mythological tales.