OXM UK writes: "Genesis (the Microsoft kind): In the beginning, an underpaid team of nerdy Microsoft employees said, "Let there be Achievements," and it was good. Great actually, as no one involved in the creation of the Gamerscore system ever imagined it would turn into such an undeniable phenomenon. If you're reading this, it's likely that you too have succumbed to the siren call, and probably have at least one game on your Gamercard that you played just because you heard it had easy Achievements.
Infinity Ward's Community Relations Manager, Robert Bowling, aptly describes Achievements as a 'fantastic way to get your players even more involved in your game and add to the replay value even further. It encourages players to delve deeper into aspects of the game that they may have missed or didn't experience their first time through. The Achievements of a game really shape the playing habits of gamers of all types, where it may encourage a casual player to play again or play through originally on a harder difficulty than they normally would.'"