Achilles was the son of Peleus and Thetis who was a Nymph and Achilles was about to be an everyday hero.
Achilles's mother Thetis wanted to make him immortal so when Achilles was a little baby Thetis dipped him in the River Styx. But what she didn't notice was that she held Achilles by his heel so making him vulnerable in the Achilles.
Crossing the Threshold
Achilles doesn't want to be in the Trojan War but he had to go to battle. He took 50 ships with him and a big army but unfortunately they landed at a different place called Mysia which was ruled by Telephus.
Telephus was wounded in battle by Achilles and was told he couldn't survive. Telephus consulted an oracle who told him that he could only be healed by the person who injured him. Telephus asked Achilles to do so and in return he told Achilles where Troy was.
Achilles and his troops march into Troy to start the battle of Troy. This happened because Agememnon, leader of the Achaeans, has one of the women as a slave from Greece and demands another one. Achilles was furious of how much Agememnon was disrespectful to him so he marched into the fight.
Achilles's friend went in to battle wearing Achilles's Armour to confuse the trojans but he died by Hector. This made Achilles mad so he went to battle to try and kill hector, he did this successfully but died when someone shot him in the Achilles.