I can't find anything in the SWF; even searching for specific medal names gives no results. As far as the Konami code, you have to put it in on the title screen. I'll put a list of known medals and how to get them legit for now... hopefully they will get approved soon.

Undigested Cheese - Beat Marley with just the Buster.
Condemned to do so After Death - Beat Past with just the Buster.
Lead on, Spirit! - Beat Future with just the Buster.
Look Upon Me! - Beat Present with just the Buster.
Konami - Type up, up, down, down, left, right, left, right, z, x at the title screen.
Christmas is Saved! - Complete the game on Normal or higher.
Collector - Get every E-Tank in the game.
Where's Wily? - Find Dr. Wily.
True Grit - Complete the game on Hard mode.
You've Got to be Joking - Complete the game on Wut mode.