Unlock teams
To unlock new teams, win the World Cup with teams from different regions:

All-Europe Team: Europe, Oceania
All-Americas Team: N. America, S. America
All-Africa Team: Africa

Unlock All-World Team
To unlock a All-World team, unlock the All-Americas, All-Asia, All-Europe and All-Africa teams.

Unlock All-Asia team
Win the World Cup with an Asian team to unlock an All-Asia team for friendlies.

Extra Teams
Win world cup on any difficulty with the following teams to get euro all stars and all america all stars:

Win with Argentina - All American stars
Win with France - Euro stars