There is really only one: Achilleus. However, the argument has been made to include Patroklos as a hero as well. If you look at the events and what Patroklos did (wore Achilleus' armor and went against superior forces) then he did do something heroic. However, since all of the events in the story revolve around Achilleus and his choices, the one true hero of the story is Achilleus.
