Pro Evolution Soccer 2016
40 Achievements
1,000
Xbox 360
League Champions
Awarded for winning the League Title in [Become a Legend]
15
How to unlock the League Champions achievement in Pro Evolution Soccer 2016 - Definitive Guide
Credit to CRAIG_83 for this info.
This is awarded for coming top of your league at the end of the season. If you are playing on Beginner difficulty then this should be no problem, just make sure you score and assist plenty as this will be helpful towards the other trophies. See World Player of the Year for more details.