PES 2010
28 Achievements
1000
Xbox 360
Perfect Season
Awarded for an undefeated season in Master League winning League, Cup and UEFA Champions League.
90
How to unlock the Perfect Season achievement in PES 2010 - Definitive Guide
shilbo, assassin
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.