There is 180 mosaic pieces to collect, in order to collect these mosaic pieces you need to play all European teams in Expedition mode three times. Every time you beat a team, you get a piece. 3 pieces per team, simple. A method of completing this Expedition mode with less effort is to turn all the CPU sliders down, enter a match, score a goal and then watch the CPU play so slow that you can put the controller down and do something else. Do keep an eye on it just in case they do score which they shouldn't, but you never know.