I forgot what exactly happened, but i think back when he was blessed, they put his whole body into the water and held him by his ankles. So his ankles were the only part of his body that never touched.
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when his mother thetis dipped him into the river styx she held him by the heel so therefore he was only vulnerable in the heel!
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It was where his mother held him by when she put him in the river Styx as a baby.
Paris shot an arrow at him and Apollo guided it to hit Achilles at his only vulnerable spot, the heel.
Achilles died when his enemy shot a poisoned arrow into his heel. Achilles' heel was the only part of his body that was vulnerable; as a baby, he had been dipped into the River Styx by his mother, who held onto him by his ankle. Achilles' immersion made him impervious to harm, but because his ankle did not contact the river, it remained mortal and vulnerable. The idiom "Achilles' heel" has come to mean a fatal flaw, a chink in one's armor.
He was shot in the heel of his foot - the only part of him that wasn't dipped in the river Styx. It was the only vulnerable part of his body.
Paris killed Achilles, with an arrow (in his heel, the only vulnerable spot on his body). or the other legend is that Paris stabbed Achillies in the back with a dagger.