Hamcha are you crazy?! Achievements are TEH SHIT!!!11
No they aren't. They're just the stupidest way to ask the player to torture himself just to increase the longevity of a game.
It's not a feature, it's cheating!
I'm not saying that achievements are the worst thing ever, just that they should return to their roots.
...
Look at games like Prince of Persia (the first trilogy, not the crappy one or the last one) had unlockable extras. They were videos (like trailers) and artworks.
They were cool and most important: they were SOMETHING.
Today achievements don't give you anything more than a stupid badge and a notice that says "Congratulation, you did it! Now do it nine more times and get this other achievement too!"
Again, Rayman 3 also had unlockable content, like minigames or videos. I mean, NO achievement gives you something playable (some minigames were also multiplayer) or something like AN HOODLUM DRESSED LIKE HARRY POTTER.
And those unlockable/hidden stuff were all over the place in games before achievements appeared, even Disney games!
Getting achievements today is really meaningless, it's like showing how much time you spent on a single game.
I mean, would you REALLY be proud of having spent 100 hours on a single game just because you were trying to get all the achievements?