It's only now that i'm entering the worls of achivements, so I don't have a lot quite yet. Over Steam among the rarest (and proudest) i've achived include BEGINNING (watch the hidden cutscene in Bit. Trip Beat), Well look at you (insert the code to play as Tofu Boy in Super Meat Boy), U-Turn (in Team Fortress 2, behead someone you couldn't see and wasn't the target in a sword charge with Demoman) and lastly, the singing Vortigaunt easter egg in Half-Life 2.