To get this achievement, select "2010 FIFA World Cup" from the Main Menu, set the difficulty to Semi-Pro or higher and give away 14 or more goals in the tournament and still win the World Cup.
Since we'll try to get "Defend Defend Defend", too, we'll do it like this:
Win your first two group stage games to make sure you'll reach the knockout stage, only score one goal a game and don't let your opponent score on you.
In your third game just go for 14 own goals, that way you have conceded at least 14 goals before the knockout stage and don't have to worry about it any more.
To score an own goal, pass the ball all the way back to the keeper, turn around and press either or to pass/lob the ball into the net.
Now you have to score two or less goals in each of the remaining 4 games and win each game to reach the necessary 11 or fewer goals for the "Defend Defend Defend" Achievement.
NOTE: Make sure to set the difficulty to Semi-Pro or higher.