The myths are stories about heroes, gods, demi-gods... Achilles was one of them. So ...
Myths related to Chiron include the Golden Fleece, Hercules and Achilles.
Hercules or Achilles
Achilles
All Greeks n the myths, especially the heroes, believed in the underworld and life after death
The Iliad and the Odyssey (the Ilian/Trojan War and Odysseus' journey back); any of the various myths about Herakles (Hercules) and/or Achilles; the myth of the Argonauts and the Golden Fleece; or any myths about the Greek gods. There are many myths not mentioned here which are also worth reading and finding out about.
She's kidding with you, demigods are just greek and roman myths like Achilles or Hercules
"Percy Jackson and the Olympians" by Rick Riordan is a popular modern series that incorporates Greek myths into its storyline. "Circe" by Madeline Miller is a novel that tells the story of the Greek goddess Circe. Another example is "The Song of Achilles" by Madeline Miller, which retells the story of Achilles and Patroclus from Greek mythology.
The legends of early Greece appear in the Iliad and Odyssey, including Achilles, Odysseus, Agamemnon, Menelaus plus many more.
There are many figures in Greco-Roman myths that remain with us, such as Hercules, a nickname for someone physically strong, Achilles, a connotation of a person's weak spot, his Achilles heel, and Venus, for an attractive girl/woman.
He is the invincible son, except for his two heels by which where his mother held him when she dipped him when he was a baby in the river Styx, of a sea goddess he was killed by Apollo or in some myths he was killed by Paris.
Achilles
Odysseus did not kill Achilles. Paris killed Achilles.