Minnesota Vikings, 1969.
The Dallas Cowboys won the NFL Super Bowl Championship in 1994
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This was the first unranked team to win the championship
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Detroit
Yes, the St. Louis Cardinals football team, which played in the NFL from 1960 to 1987, won an NFL Championship in 1947 when they were based in Chicago. They did not win any championships while based in St. Louis. The team eventually relocated to Arizona and is now known as the Arizona Cardinals.
there were no divisions
Yes. The 2010 Seattle Seahawks became the first team in NFL history to win a division title with a 7-9 record.
That was Elgie Tobin who led the 1920 Akron Pros to the first NFL championship.
The Green Bay Packers won what were retrospectively named Super Bowl I and II, but then they were named the NFL-AFL championship game. The NY Jets were the first team to win a Super Bowl when it was called the Super Bowl.