Achivements can move up to 40,000 copies of a game.

[thekitchensink]

Kantor said:

thekitchensink said:
Well, I know that, all other things being equal, I tend to choose the 360 version because I prefer Achievements to Trophies. Like with Arkham Asylum, if the PS3 didn't have the extra content, I'd have got it on the 360.

I don't understand when people say this. They are the same thing! The only difference is that one is a number and one is an icon. The actual "achievement", ie the thing you do to get that number/icon, is the same. That should really be the most important part, the feeling of knowing you have done it, rather than the visual feedback given.

Indeed.  But, given that they are pretty much the same thing, I just prefer the 'feel' of Achievements.  Not a slag on Trophies by any means.