Challenge maps and collectibles. I'm thinking mostly of Arkham Asylum and City, where finishing the actual game doesn't really count for anything, because there's still some sort of thing you have to get before you can say you're really done with the game.
I know it's an optional thing, and I don't usually go for them, but it just irks me when you've beaten the game and it tells you you're less than halfway towards completion. It almost feels like the developers are disappointed in me for not doing what they want me to do.
I know it's an optional thing, and I don't usually go for them, but it just irks me when you've beaten the game and it tells you you're less than halfway towards completion. It almost feels like the developers are disappointed in me for not doing what they want me to do.