I disagree with achievements entirely. They promote improper gameplay, and motivated players to play the game irregularly to achieve superficial goals. I've played multiple games with achievements that have caused me to fundamentally play the game differently, and in multiplayer games most of the time these achievements act at the detriment to the rest of the team. When I played World of Warcraft, I was an achievement whore, I was Top 100 in the US for about a month, and most of the achievements require you to do things that rely on other people, and often times they don't want to do them.
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