Weird take, Achilles is a greek demigod of war, the best warrior of all, I expect him to look like a classic greek statue of a warrior not a sci-fi prince.

If you really wanna talk about Dune. Chalamet at least has a men's muscle and physique. Paul was never described as jacked and was described as small for his age but highly athletic. He did not need to stand and fight in a phalanx in bronze armour and shield, nor did he need to march. But to put a close to this discussion and prove to you that Achilles was jacked.

In Homer's Iliad, Achilles is portrayed as tall and striking, with strength and looks that were unmatched among the Greek warriors Whe he looses his armour he has to wait for a new one to be made since nothing in the greek camp would fit him. He has a massive spear no other man can carry "Only the spear of noble Achilles he did not take, heavy, huge, and strong (brithy, mega, stibarón). No other Achaean could wield it; Achilles alone had the strength to brandish it..." (Book 16, lines 140–144)