3. Final Fantasy XI
When Final Fantasy XI went online on PC, Xbox 360 and PS2, pretty much everyone who grew up on a diet of Final Fantasy went out and bought it. And although most of the JRPG fans left pretty quickly, it still in fact enjoys a healthy enough community of hardcore MMO fans to this day. With the Xbox 360 version, Square were kind enough to include achievements. These achievements are some of the most notoriously difficult in existence, and represent almost a life time of time and effort.
Why Youll Never 100% It: Youll never 100% it, quite simply, because youll never have time. Basically, youll have to have a top level character (75) from every class (of which there are 18). Now, each character will take you approximately 1 real-world month to level, and thats if you completely ignore your loved ones, friends, job etc. Lets see what kind of shape your life is in after 18 months of that. If youre a compulsive achievement hunter, stay the hell away from FFXI for the good of your health.