Sometimes spelled Achilles. A big Greek hero that fought against the Trojans. He’s already dead by the time the Odyssey begins, so we only see him in the Underworld. It is interesting that in the Iliad we hear Achilleus was given a choice: live a long and uneventful life, or get lots of glory and then die. Obviously, he chose the latter, but when we hear him speak as a "shade" it looks like he regrets it. He says he would rather live in the real world as the lowliest slave than be Big Man in Dead People Land.