The other day I was playing Farm Frenzy 4 on Steam. Farm Frenzy 4 is a time management game that includes a number of Steam Achievements, including this one.
Steam really shouldn’t be in the business of allowing achievements for continuous, nonstop play. On the one hand, most people are going to do the same thing I’m going to do and just leave the damn game running in the background. On the other hand, actually spend 12 hours straight playing a game would not be a wise or healthy thing to do, and Steam and game developers should not be encouraging such behavior.