Kleos, the ultimate end?

I was very shocked that Achilles (well, his spirit) said he would take back his decision in Troy to stay and fight rather than return to a less glorious life as a farmer. Is this the same hero who spent his life chasing kleos no matter the risk? But where did this chase get him? Eternity in the underworld along with everyone who chose to live their life for something besides glory. Every nobody, peasant, and king all received the same fate. Sure the souls of Petroklus, Antilochus, and Aias are with him, but they no longer have anything to fight for. Their life's greatest achievement is behind them and they have no new goal to chase in the underworld. They have lost their purpose and the essence of their existence. Glory and honor achieved, what do they have left? Achilles says that even to rule over his lifeless companions in the underworld won't bring him any more satisfaction than an average life as an average human on earth, no longer "god-like Achilles". Odysseus disagrees saying, "No man before has been more blessed than you, nor ever will be." He still sees kleos as the ultimate end. Once a man has honor and glory, what more can he want? But what happens when kleos isn't enough? What comes next? For Achilles, the only left is despair, regret, and the hope that his son will make him proud. Is this what Odysseus has waiting for him at the end of his adventurous life?