Olympic Games: London 2012

Select to play Event Play mode from the main menu, select to play either Table Tennis or Volleyball. You must score 10 points straight from your serve over the course of your career. I chose to do this on Table Tennis as I felt this was my stronger event. I tried to put as much power and swerve as I could into my serve and hoped that the opponent missed the ball. This will come over time. Once completed the trophy will unlock.

Tip: This can be done with 2 controllers. Simply start a 2p table tennis match and as player 1, boost your aces until the trophy pops up. (Thanks to johnnyhotrocks)