New Xbox achievement site looks to standardize accomplishments
Based on the idea that the harder an achievement is to unlock (no matter its Gamerscore value) the more points it should be worth, TrueAchievements uses a formula that takes into account how many players unlocked a specific achievement. Compared to the game's total population, a difficulty multiplier is calculated. The multiplier is figured into the game's Gamerscore and — presto! — a new, more accurate way to calculate a person's skill ensues.
Those who earned all the Avatar achievements will be humbled to know that it's the game with the lowest TrueAchievement value.