PES 2010

You need to win EVERY game, no draws unfortunately. You can sim but you must win every game and win the 38 league games, all Cup games and Champions League games. I suggest playing with auto-save, sticking it on easy and if you lose just go to dashboard. Top class sides will win more than poor ones in simmed games, so I would choose a good team like Barcelona, Chelsea or Manchester United. The achievement unlocks when you go into the next season - not immediately after the last win.