Spore Fan is a general achievement present in Spore. This achievement is rewarded for having Spore running for 50+ hours.
Tips and Tricks
You don't really have to do anything to get this Achievement. You can start the game at any stage and just leave the computer — the hours will still count, even when paused. Using this method takes two days and two hours to earn the achievement.
You can also play three hours a day for instance and then in a little over half of a month you'll have the achievement.
Closing the game won't reset the hour count to get this achievement.