You probably skipped a lot of tough boss battles through dialogue. The Thorm bosses in Act 2, Orthon Yugir, the Creche leaders in Act 1 as well as killing all the Duergar plus Nere in Grymforge. Killing the wardensin Moonrise Tower to save the gnomes and tieflings. There's also many minidungeons like the haunted house near last light inn which has the cave underneath with shapeshifters or the Mason's hideaway.
Well, possibly. I did most of the mentioned - convinced one of the act2 bosses to kill himself but fought other two as it was more fun. Probably my biggest skip was the gith creche, as I used the
vault with artefact to safely get away
.