Both Herclues and Achilles were born half-god, Hercules by his father: Zeus, and Achilles by his mother: Thetis.
Thetis further attempted to make Achilles invulnerable by dipping him in the Styx.
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According to legend, Achilles was dipped into the river Styx, causing him to become invincible, but since he was held up by his heel, that part didin't get dipped, and became his one vulnerable point.
Achilles was dipped into the River Styx from his heel when he was a baby by his mother Thetis, which allowed him to become nearly invincible. His only weakness was his heel. Achilles was in war and fought for the Greeks. He got shot with an arrow through his heel and it killed him.
His father Zeus, made him immortal.
By carrying out his 12 labors.
'cause he killed someone