What about disc space, does it take up any? Achievement I mean. I dont care how long it takes to make, just what you can fit in the game.
Achievements are small enough in nature, they're just nifty little signs of your accomplishments without having any real use or feature behind them. It's just a simple few extra lines to some code to determine what you need to do to get achievements. After that, achievements become stored in Microsoft's/Sony's/Valve's databases and are attached to your profile. End of that story.
I don't really care what the achievements are, but I'd like you to be able to get all of them in a single playthrough if you do things properly. Mass Effect 1's achievements bothered me to no end because you needed to play through the game over and over again to get so many different possible achievement combinations. I think Oblivion did it well, just achievements for completing specific quests, guild advancement, and doing a few story-related things like closing your first Oblivion gate.