Inspired by this thread, I'm thinking of starting a new save as the 769 Duke of Pomerania.
I want to try for the Slavic Union, Never Start a Land War in Asia (start in Western Europe, control Eastern Steppe), and Norse-East (have Norse Culture, control Kingdom of Mongolia) achievements in a single game. Here's my reasoning:
1) Pomerania is the easternmost realm in the Western Europe region;
2) Pomeranian culture has Hussar LC bonuses and can create the Slavic Union;
3) Pomerania is coastal and has Catholics nearby, so plenty of early game raiding targets;
4) I can take multiple Romuva holy sites, reform it, and form the Wendish Empire "along the way" as I expand eastward to form the Slavic Union;
5) Pomerania is close to Germanic rulers I can invite and land to preserve Norse culture for conversion after making the Slavic Union.
Seems pretty doable to me, as long as I'm willing to slog my way all across Siberia. Anyone see any reason why this wouldn't work?