Achilles is immortal, or at least invincible, except when you fatally wound him at his foot part where his mother held him while melting his "mortal part."
I like Achilles because he is one of the pioneer of being a Greek hero and can be a role model of being strong in spite of all the troubles that does not make you one of the "normal" people.
^Though the last one is an opinion part which you can answer on your own.

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Achilles is strong, brave, and unconquerable. He will not die except if you stike his heel that was the only part of his body that was not bathe by the river. I like him because he is powerful but sometimes, I will not like him once he gets to egoistic.