No, Achilles is the son of Peleus and Thetis.
Zeus was Achilles' father.
To give honor to her son Achilles.
Thetis does not promise anything, but Zeus does promise Thetis that her son Achilles will be honored.
Achilleus (son of Thetis) Aeacus (son of Zeus) Aeneas (son of Aphrodite) Agenor (son of Poseidon) Amphion (son of Zeus) Arcas (son of Zeus) Asclepius (son of Apollo) Belus (son of Poseidon)
Hermes was Zeus' son and his messenger, therefore the answer is he delivered messages to anyone Zeus instructed him to. At least one of these messages is referred to in the Iliad by Homer, where Zeus instructs Hermes to Guide King Priam of Troy To Achilles so that Achilles might grant Priam the right to give his son an honourable funeral. You can read about the many other messages Hermes carried in "Hermes the Olympian", available on Amazon.
She promises to ask Zeus to side with the Trojans in the battle.
Zeus was Achilles' father.
Hades and Zeus are brothers; Hercules is a son of Zeus and, as such, a nephew of Hades.
To give honor to her son Achilles.
If by demigod you mean a mortal who had an immortal for a parent, there was Heracles, son of Zeus; Perseus, son of Zeus; Orpheus, son of the Muse Calliope; Achilles, son of the sea nymph Thetis; Deucalion, son of the Titan Prometheus; Phaethon, son of Helios; Asclepius, son of Apollo; Minos, Sarpedon, and Radamanthus, sons of Zeus; Tantalus, son of Zeus; Helen, daughter of Zeus; and Pollux, son of Zeus.
Thetis does not promise anything, but Zeus does promise Thetis that her son Achilles will be honored.
Thetis gave prophesy that she would have a son greater than his father; Zeus and Poseidon did not pursue her afterwards but made it so she would have a son by a mortal. That son was Achilles.
Yes, Achilles was the son of Peleus (mortal) and Thetis (divine). (Hercules) Heracles was the son of Zeus (divine) and Alcmene (human).
That Thetis will know how her son is dishonored and seek to make things right for Achilles by going to Zeus.
Achilleus (son of Thetis) Aeacus (son of Zeus) Aeneas (son of Aphrodite) Agenor (son of Poseidon) Amphion (son of Zeus) Arcas (son of Zeus) Asclepius (son of Apollo) Belus (son of Poseidon)
Troy is the son of Achilles.
Hermes was Zeus' son and his messenger, therefore the answer is he delivered messages to anyone Zeus instructed him to. At least one of these messages is referred to in the Iliad by Homer, where Zeus instructs Hermes to Guide King Priam of Troy To Achilles so that Achilles might grant Priam the right to give his son an honourable funeral. You can read about the many other messages Hermes carried in "Hermes the Olympian", available on Amazon.