How are Beowulf and Achilles similar as epic heros?
Both Beowulf and Achilles embody the belief systems of their people. They are both well-known for their adventures and exploits. They are both admired for their successes and are the subject of many stories told by the bards of their respective time periods. They are both known for their strength, courage, and skill in battle. They are both known for their honor in battle--neither would fight an opponent who wasn't at least equally prepared and armed as he was.
Achilles' weakness is his heel which is the only spot not dipped into the river for protection since that is where his mother held him; Beowulf's weakness is his old age which proves no match against his last opponent: the dragon.