8. Rock Band
Possibly the greatest casual game ever created by human minds and hands, Rock Star can also double as one of the most hardcore. Many of us will remember weeks, months even, spent playing Rock Band at every available waking moment, but still, I bet even the most hardcore Rock Band obsessive has struggled to unlock even mid-tier achievements/trophies. Why Youll Never 100% It: Finishing any of the solo tours on expert is a biblical challenge but particularly on the drums, as to complete even beginner tracks youll have to basically be able to play the actual drums. And by the final tracks of the game, youll essentially be required to be at the same standard as the likes of Keith Moon, Neal Peart and Nicko McBrain and if you are, why the hell arent you famous? And, achievement/trophy wise, thats just the tip of the iceberg. Honestly, youd be better off actually starting a band and making a run at a record contract than attempting to attain 100% in Rock Band. And that goes for every Rock Band game since too.