Achilles Mother was Thetis, a Neried. Achilles Father, The mortal king peleus, king of the Myrmidons which are really skilled Soldiers ready for battle.
Achilles mother was really Concern of Achilles mortality so she did everything to make him immortal, like burning him in fire and puting on Ambrosail ointment on the wounds. Not only that she burned him she also Dunked him in the River Styx to make him invulnerable Everywhere Except his Achilles Heel which can kill him if you slash,bowed his heel.
When Achilles was still a child, A seer predicted that He/Achilles will die fighting the Trojans. When Achilles Mother heard about this, She tried everything to stop the prediction, Like disguising him/Achilles like a girl and sent him to live on Aegean island of Skyros. But Achilles left when he got older and joined the Greek army.
Since Achilles has the right to take the Myrmidons to battle because his father is peleus which peleus was the king of the Myrmidons. When Achilles was invited to help the Greeks fight the Trojans, Achilles accepted and brought his army, battle after battle Achilles has led his allies to war, But even tho Achilles led his allies to battle and win almost all of time, this War lasted 10 Bloody Years.
On the ninth year of the Trojan war Achilles killed Paris brother Hector because Hector killed Achilles best friend Patroclus, and because of that Achilles Stabbed Hector down the throat with NO Hesitations, after that Achilles Dragged Hectors body back to camp and threw it in the garbage.
After Hectors Death Achilles kept leading attacks again and again and killing thousands of Trojans but when Achilles was leading a attack he got shot at his weak spot, His Achilles Heel, He got shot by Paris and the help of Apollo, But when the Greeks Saw his death or heard about it they were shocked and Sad that they lost a Great Greek Warrior.