I think in a new patch that Ironclad should make it so that you get a bonus when you achive an achievement. This way the players who branch out and play different maps can get permently awarded much like in Mass Effect.
They could do this by just keeping it as an off-line feature of the could make it like Star Wars Battlefront 2 and make it so that the players with the most time devoted to there game is awarded with bonuses for what they have done.
Just an idea. Post what you think so maybe Ironclad will put it in if everybody likes the idea.
~Troojan