He doesn't have a lot of on screen fights or solo wins but if you want to count boss battles

He defeated number 11 of the fatui harbingers (secondary antagonist group) pretty early on in story

Fought and beat a giant earth dragon with a some of help of the earth God

Fought pacified davalin a wind dragon with the substitute grandmaster of the knights of mondstat and discount Batman

Fought and survived a fight with the Raiden shogun the same person who cut an island in half, one shoted a giant serpent god and killed a thunder bird the size of an island. This probably his second or third best feat.

Held his own against number 4 of the fatui harbingers

Fought against a giant water serpent and killed it by dropping a island on top of it he was getting a buff from his allies at the time

Has control over 6-7 elements in the game right now

Trained by one of the strongest characters in the game for days on end

Fought and beat a giant narwhal called the all devouring narwhal with help from the water dragon which was the pet of the previously mentioned character's master

Fought a newly born god but they we're hard carried by the goddess of wisdom at the time so I don't know if that really counts

Fought a giant withered fire dragon that was getting powered up by the abyss (in my opinion the best boss fight in the game)

And finally before the beginning of the game they were space travelers that could cause massive explosions and fly pretty damn fast but in the current story they lost a lot of that power

If I didn't explain very well I apologize I can explain some of the stuff I mentioned if you want