tbh, given the current mood of the Thor comics, I wouldn't be surprised if they introduced a more powerful, female version of Surtur .
Also, going back like... a week or something:
Was watching Thor yesterday, and in our discussion of Thor's feats in the MCU I forgot one of his best...
He took out the fucking DESTROYER. The Asgardian Super Armour that was shown to be capable of vaporizing multiple Frost Giants in a single hit, and easily took out Lady Sif and the Warriors Three.
And then Thor gets his hammer back, and WRECKS it. Doesn't even really seem to put in much effort either.
Bonus round: in Dark World, he one-shots a Kronan. And seeing as Kronan's are generally considered to be a fairly durable race (look at all the punishment Korg tanked), I think it's safe to call that an impressive, if somewhat obscure feat.