View the finally official achevements or Watch another hero do so
They look pretty much the same as the original leaked list, with some minor changes. Also, you can get over 70% of the game's achievements/gamerscore by standing there as a buddy actually does the achievement XD
Some things on there really shouldn't be co-op though. Like getting all the keys and stuff. I guess it makes sense if you play the whole story with a buddy, but still, it should be only unlock if you've witnessed the buddy picking up every key before the final one. Examples like that. Oh well.
This edit will also create new pages on Giant Bomb for:Beware, you are proposing to add brand new pages to the wiki along with your edits. Make sure this is what you intended. This will likely increase the time it takes for your changes to go live.