Defeat the indicated set of teams in Respect The Street mode to unlock the corresponding AFC or NFC All-Star team:

AFC East: Patriots, Jets, Bills, and Dolphins
AFC North: Ravens, Bengals, Steelers, and Browns
AFC South: Colts, Jaguars, Titans, and Texans
AFC West: Chargers, Chiefs, Broncos, and Raiders
NFC East: Cowboys, Giants, Eagles, and Redskins
NFC North: Bears, Vikings, Packers, and Lions
NFC South: Saints, Panthers, Falcons, and Buccaneers
NFC West: Seahawks, 49ers, Rams, and Cardinals