Play a UEFA league. you start in the 6 game qualifier. you only need to win a game, but you must WIN. If you tie, it will not count, and as there are no Penalty kicks during these matches, you will have to actually score goals during the game.
I did this on beginner and 5 minute halfs, which is the quickest way to do it, but it took me three games because I wasn't able to reliably score (gamer issue, not a problem with the game)