All fifty of Portal 2's Achievements have been uncovered by Xbox360Achievements.org. In typical Valve fashion, there are some comedic gems in the list, like "The Part Where He Kills You," and some in-jokes, including "Narbacular Drop" and, yes, "Still Alive." But one Achievement is generating some real buzz: "Ship Overboard" has players discovering "the missing experiment."

Some have suggested that this Achievement is a possible reference to the Borealis, an Aperture Science vessel first mentioned in Half-Life 2: Episode Two. In the brief scene (embedded after the break), Isaac Kleiner notes that the Borealis contains some kind of technology that can help humanity. Could Portal 2 tie into the final Half-Life 2 episode? Or are overeager fans simply grasping at nothing? April 20 can't come soon enough.