Originally posted by: Xavier434
I really enjoy going after achievements if they are well thought out. I do hope that studies like these do not persuade game developers to just start tossing in all sorts of ridiculous achievements just to increase the numbers though. That could defeat the purpose.
I'm not quite sure if this answers your exact concern, but it sounds along the lines of what you were thinking:
From Wikipedia
On February 1, 2007 Microsoft announced on their Gamerscore Blog some new policies that developers must follow related to Gamerscore and Achievements in future releases.[10] All games must have 1,000 Gamerscore points in the base game - the title could ship with fewer than 1,000 points, but anything added later must be free. Game developers also now have the option of adding up to 250 points via downloadable content (for a total of 1,250 points) - this content can be either free or paid. Xbox Live Arcade titles may add up to 50 points via downloadable content (for a total of 250 points).
I think I also remember reading that the base 1000 points had to be distributed within fewer than 50 total achievements, but that may not be official. I know The Orange Box had many more than 50, but perhaps that was given special rights due to the 5-games-in-1 situation.