For the easiest way to do this start to World Cup with a good team like Spain or Brazil. When you are offered to change the groups around put yourself in the group with Iran, Costa Rica and Algeria which are some of the weakest teams in the tournament (open for debate). Also, put the other strongest teams in the same groups so some are knocked out and you wont have to play them.
Play the group stages on Semi-Pro difficulty. Most people will be able to put 4 or 5 past each of the teams on Semi-Pro. If not, set the game to 8 or 10 minutes a half to give you longer to score. You should have scored at least 10 in the group stages.
After winning the groups you will progress to the last 16. Winning the last 16 and quarter finals you should have the achievement. If you haven't got the achievement after five long games on Semi-Pro(3 of which are very easy games) you might want to practice more.