One late legend was that it hit his vulnerable heel; another is that Paris knifed him in the back. These don't appear in the earlier sources, so take your pick.
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Paris shot an arrow at him and Apollo guided it to hit Achilles at his only vulnerable spot, the heel.
Paris who was Hectors brother shot him with an arrow in the ankle heel part. When Achilles was a baby his mom dipped him in a magical river that made the Gods look after him. When she dipped baby Achilles in the water he was held by his heel there fore that was his weak spot so when Paris hit him it made him die.
In revenge for the Greeks having abducted the daughter of an Apollo priest, Apollo spread a plague among the Greeks. He also guided the arrow Paris shot at Achilles, so it hit his only vulnerable spot, and Achilles died.
She tried to make him immortal. She did this by dipping him in the River Styx, but she held him by his heel. Therefore, when Paris hit him in the heel with an arrow, it killed him. For more information, check out the related link.
The legened is that when Achilles was fighting in the Trojan war he was hit by a bow and arrow and it killed him because when he was little he was dipped in a special river and the only part that that was not dipped was his Achilles heel