Whenever I go up a level in WoW, or gain a kill in Quake, or beat a boss and pick up his loot I have a fake achievement.
Sure, there are some real achievements in there, but they are not provided by the game world - they are almost a side effect. Most likely they are not the reason that people are playing these games, but they are a useful excuse to continue playing.
Consider how much real achievement we would see if all the motivated hackers put down WoW and started up their development environment of choice.
I'm not saying that games aren't cool (I love computer games and have been strongly addicted in the past) but don't delude yourself into thinking that they are more productive than applying yourself directly to the task you are trying to master.
I might get HN points (i.e Karma) from posting this comment. That is not my goal, I don't care about those. My goal is to inspire fellow hackers enough to pay attention to my cool start-up (Gridspy). HN doesn't give me "pay attention to me" points - I don't think that is really possible.