To complete the game, you need to complete the tutorial and story mode (Brazil is the final match in Story mode). Also, during the story mode, you need to earn 20 stars. Stars are earned for doing objectives in the game. One objective will always be win the match, so 1 star is guaranteed. There are 14 matches in story mode, so 14 star is guaranteed no matter what, and you need 6 more. Objectives can be:
- Use a specific ability
- Score x goals
- Do not concede any goalsYou can play the entire game on easy difficulty (change in option)
, and using a cheese strategy (found by ChinDocta) shown in the video below, you will win most games 1-0, so for any matches that have do not concede any goals, you are likely to succeed. I had 25 stars by the end of the playthrough without trying for any specific objective personally. Basic premise of the strategy is to make a goal and then box yourself in so that CPU can't get near the ball.
Sorry the video is a bit long, but wanted to cover as much as possible, and make it as easy as possible.