All the achievements have a number in the top right corner. Does anyone know what they mean? At first, I thought it was points, but the summary just counts the number of achievements, it doesn't sum the numbers. Then I thought it might be difficulty, the harder an achievement, the higher the numbers. But voting in 10 polls has a "10", and so does "Become the most active player in 3 consecutive days." The former is something anyone can do easily, taking all the time you want. The latter is quite hard to do.