Okay this is all just how I understand it since I only recently heard of this game and am in the process of reading up more.
From how I understand it, "quests" are simply contracts you agree to from other players or NPCs. If I understand correctly due to the AI they will be using, NPCs can basically do everything a player can. So if an NPC gets attacked by a bear often he might put out a request for someone to kill the bear.
You then agree to the contract, kill the bear and go get your reward from whoever put out the request.
So basically there is no questing in the sense of the game seeing you did quest X so now you unlock quest Y.
Might not be correct but that is how I understand it.