Europe is over there: Starting as a native tribe in American continents or Australia, ensure that all provinces in colonial regions are owned by nations that don't have colonial origins.
Starting conditions:
Is a native tribe
No custom nations exist.
Game starts at the default starting date and with default settings.
Completion conditions:
All provinces in colonial regions are owned by nations whose primary culture is in Aboriginal, Andean, Apachean, Araucanian, Aridoamerican, Caddoan, Caribbean, Central Algonquian, Central American, Chibchan, Eastern Algonquian, Eskaleut, Iroquoian, Je, Mayan, Muskogean, Na-Déné, Otomanguean, Penutian, Plains Algonquian, Siouan, Sonoran or Tupi culture groups.
The role of new world natives is to be food for Europeans so driving the colonizers out completely deserves its own achievement. It's not impossible or anything since colonial overlords don't automatically defend their colonies if the attacker is from a colonial region.
Edit: Changed the suggestion quite a bit