(Oh, maybe that's the real drive: Accomplishment. Finish the level, clear the dungeon, score 100%.)
That is probably the best thing about not having a questbook. If you feel a quest is finished, it is. You don't nééd to finish off that last guard, or collect all 30 herbs. We all know it can drive you mad when your book says something akin to '13/15 completed'.
It's a mistake so many games make. When I'm discovering castles, never say: "One out of five castles found". Because at that point if I'd die, my restless soul would roam the earth looking for a gamer to find the other four, so I could finally ascend to heaven.
