What happens to Achilles?
If you mean how does Achilles die, in Homer’s Illian, Achilles is killed outside the walls of Troy. Since his mother held him by his heel when she dipped him in the waters of the river that made him invincible in battle, the only place he could be injured is his heel. One of the Trojans, I believe it was Paris, King Priam’s son and the guy who started the war by kidnapping Helen, shoots him with a poisoned arrow in the heel. I believe it was after a duel between Achilles and Hector, Paris’ older brother and the heir to the kingdom. Why not look it up in Wickipedia or some other online site?