Remember the good ol' days, when you could just beat a game, pop open a celebratory 2-liter of Mountain Dew, and then move on with your life? Those days went away the instant that Achievements were introduced. Now we live in a world where your work on a game is done only when you've beaten each level perfectly 10 times and played for a month straight – and that's the easy ones. Some games include achievements that seem like jokes – surely the developers never thought anyone would actually waste enough time to complete them. But gamers never walk away from a challenge. They do, however, bitch about them on the internet. Here are the 10 most frustrating achievements in Xbox Live history.

10) Aperture Science (Portal) – Earn gold medals on all Portal challenges (40G)

While Portal got a lot of praise when it came out for its unique, hilarious, and fun style of gameplay, no one really mentioned how this achievement would take all that goodness and twist it around to sinister ends. A few of the challenges could be entertaining if only to screw around with the game's great mechanics, but some other ones (Least Steps, go walk off a cliff in 10 steps or less, please) were brutally difficult and frustrating. The only thing that could comfort you after a few hours of these challenges would be a nice big slice of cake, and …wait – WHAT? NOOOOOOOOOOOO!!!