Instead of having all three of your characters in your empire, you could have played those games with one of them and display those medals in your forum posts.
Go to 'edit my characters' and select one of them as default. Those medals will then display like others you see in this thread.
Also, if you really want to start your own empire, have a bit of a pep talk and a theme to set it apart from the already existing ones. Maybe a 'new player alliance' or something like that. Not to sound too harsh, but I don't think that those playing in the MV for some time will join if you're still playing on 'simple'.

PS: Don't be too shy about the difficulty. The AI doesn't cheat and until you go beyond tough doesn't receive any boni to their abilities either. Even at the ominous sounding 'crippling' it just has a 25% bonus to the economy. (I myself are just up to tough, but really, once you get the hang of the basics, you should try to progress to at least normal or challenging as quickly as possible. The game is so much more rewarding at those levels since the AI starts to it's full Intelligence only at tough.)