Study: More Xbox 360 achievements = better reviews, more sales

A new study by Electronic Entertainment Design and Research (EEDAR) suggests that the Xbox 360 achievement system (here called "accomplishments" for some reason) has an effect on the title's success. According to the press release, EEDAR found a "strong connection between a game title's diversity of Accomplishment types with that game's profitability -- pointing to the idea that the more diverse the Accomplishments available to the user, the more enjoyable the game, higher review scores, more units sold."

We're hesitant to conclude that the number of achievements is a causality for gamer enjoyment, although we know of a few people who swear by their gamerscore (and a handful of games whose sales, but not necessarily reviews, were greatly increased because of their achievements). We wonder if the correlation is instead a sign that developers who spend more time ensuring the quality of their games also extend that hard-work towards the achievements, as well. If Valve's The Orange Box sells a bajillion copies, it's not necessarily because it has 99 ways to up your gamerscore.