User blog comment:The Deadliest Warrior/Achilles vs. Hercules/@comment-2.83.173.249-20131001164524

Hercules surely would win. Achilles was not invulnerable has people think. In the Homer's Illiad (the main ancient source about Achilles), in book 21 Asteropaeus challenged Achilles to a duel and threw 2 spears at him. One hit Achilles elbow drawing a spurt of blood. And even ancient paintings describe the death of Achilles. He was shoot and killed by an arrow (or arrows) to the chest... not his heel.

His said invulnerability is only mentioned many centuries later (1st AD) and there's no other surving previous sources. Achilles lived in the 7th century BC.

So he was not invulnerable, but was a demigod and considered the best figther/warrior of his time.

Harakles (Hercules) was considered the greatest hero of all greeks (but Herakles "lived and died" a few centuries before Achilles) and defeated many monsters considered immortal and invulnerable (the Hydra was actually both... it's main head was immortal and invulnerable but Herakles was a cunning warrior and after realizing such, he lifted a huge rock buried the main Hydra's head underneath it.

He also fougth Anteus, the giant... blessed by Gaea, with the strength of the Earth (in some accounts equal to that of Heercules)  as long as Anteus touched the ground he would not tire and could not be defeated. Herakles fougth him as an equal but after a long figth he started to get tired but his opponent continued figthing as if they only started at that moment. Herakles would throw him to the ground dozens of times and each time he thought Anteus was defeated he would just raise and continue to figth. Herakles realized what was happening and so, lifted him up and crushed him in a bear hold, finally killing him.

Herakles was cunning and when foes would prove too much for his strength alone he would always find out his opponents weaknesses and often explored them.