So I was looking through global stats on steam achievements and found an odd pattern. The amount of people who actually have the achievements for completing a game is only around 50%. Even the famed portal, where there is only 3 or 4 hours and the single player is all there is to it has only gotten to 54% complete.
There are things that could skew this like people who got a package deal and never actually intend to play a game, people currently in the middle of playing through it or games where you could have beaten it off of steam and just happened to pick up the steam version, but even then, that's a small percent change. People should post games where there's a story mode and they have an achievement for completing the game or an achievement you can only get from beating the game. I kinda wanna see how universal this is.
http://steamcommunity.com/stats/Unre.../achievements/ Lol, 2.7%