To unlock teams, you have to make the following achievements:
All-African team: Win the World Cup with an African team.
All-Americans team: Win the World Cup with a North or South American team.
All-Asian team: Win the World Cup with an Asian team.
All-European team: Win the World Cup with an European team.
All-World team: Unlock the All-African, All-Americans, All-Asian, and All-European all-star teams.