Orb Points are a scoring system used to compare Achievements across multiple games. Each achievement gives a certain number of points, depending on the difficulty of the achievement. Players will also receive Orb Coins for the achievement, usually one coin for each 100 Orb Points.
So far all achievements have given a multiple of 50 orb points, up to a maximum of 1000.
The Achievements area of the site has allowed you to compare your points with your friends since April 23, 2008; and since August 13, 2008, it has also been possible to compare them across the entire player base.