Thinking back to games I have played in the past and also new games that I have played recently over the past few years, games that come to mind that I have completely beat are games such as Alex The Kidd, Super Mario World and such. More recent games that have a lot more to them for achievements like finding things in the game, unlocking different parts to continue through, I don't think there is any that I can say I have 100% beaten that are like that. Many games now are created so they take a long time to fully complete and all too often, many games get left unbeaten because of that.