You can only get this achievement during the second or third mini-games of the "Jumbo Squid" episode. In this game, there are four objects, but the premise is identical to the first mini game. It is far easier to do this in the second mini game, since the third mini game features three or four objects falling at a time. In general, you are better off being closer to the Kinect, since you will be able to react faster. Not only can you not put anything in the wrong spot, but you cannot let anything drop to the bottom. Everything that falls must be put into it's proper place, though if time runs out and you have not yet caught the item, it will not count against you.