It appears another classic co-op game is going to make its way to the Xbox Live Arcade. The Sega Genesis classic Gunstar Heroes has seen a leaked achievement list. As with most previous games that have had their achievement lists leaked, it all but confirms an imminent release of the title.
Gunstar Heroes is a side scrolling shooter similar to Contra, but it has a few core differences. For one players have a life meter, so instead of taking just one shot and dying they can take multiple shots. There's also a bunch of different characters to choose from each with their own unique strengths and weaknesses. We fully expect the game to support online 2 player co-op like some of Sega's other offerings.
More information has it becomes available, for now enjoy some screens courtesy of Puredegarbanzos.