Because when his mother dipped him in the Styx, that is where she held on to him so she could pull him out. So the rest of him was impervious to almost anything, but in that one spot, he was still normal.
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due to Achilles mother Achilles heal was his weakest point because that is were she held him as she dipped him into the river styxs to make him immortal
Achilles was dipped into river Styx by the heel when he was a baby and in ancient Greek legends the river would make you invincible but you had to have a weak spot so achilles heel was his weak spot. So the term Achilles heel is used it means your weak spot.
His mother held the baby Achilles by the heel when she dipped him in the River Styx to make him invulnerable to injury. His heel was not exposed to the magic of the river water and he died after being shot in the heel with an arrow.
It was pure chance - no one knew about Achilles' weak spot except for himself, his mother, and possibly his mentor, Chiron.
Well, for one thing, Achilles was said to not die because his mother dipped him in a special kind of water. But she forgot the heal. When he went to battle, someone struck him in the hell and he died. So, when someone is said to have an "Achilles Heel" they have a weak spot.
Achilles was made immortal by being dipped into the River Styx. He was held by his heel, which is why that is his weak spot. When he was shot there, he died.