Well sinking an island with a blow without breaking his arm or taking any damage to his body should count for something on the durability issue I guess. Aside from that he can trade blows with his brother Gouken who is more or less his equal. He also took on a volcanic eruption at point blank range recently, though he was in his most powerful form when it happened.
what is akumas best durability feat?
I say he tanked an island buster because gouken I assume can do what he can, but i dont know that so I take it back
K so u are stil with luffy, anyways i have discovered that Akuma can make himself intangible