Play 100 matches in any game mode.
Ok this is quite simple play 100 games accross the games various game modes..
This should be your last chievo..
Play the world cup and the tours along the way. Aswell as one game with each nation.. After this you should have played around 55 matches..
Now the quickest way to get to a 100 is play the place kick on hard. Simply miss your 3 kicks and the CPU will hit all there. With the loading screens etc each kick contest will take about 2 mins.
Hope this helps