Have'nt Checked XBLA yet, but word is that Streets of Rage 2 is on XBLA with Co-op and an HD upgrade.
Content: Streets of Rage 2
Price: 400 Microsoft Points
Availability: All Xbox LIVE regions
Dash Text: [ESRB: E (EVERYONE) Fantasy Violence] Single Player, Live Multiplayer 1-2, Local Multiplayer 1-2, HD (High Definition). To commemorate their defeat of the Syndicate exactly one year before, Blaze, Adam and Axel went out to celebrate. The next morning, however, Axel received a frantic phone call from Adam's younger brother, Eddie 'Skate' Hunter. Blaze and Axel rushed over and found Adam and Skate's house wrecked and a picture of Adam chained to a wall at the feet of Mr. X. The city was returned to its nightmarish state and criminals were once again running rampant. Unable to contact their old friend in artillery, Axel and Blaze team up with Skate and Max Thunder to free the city and rescue Adam from the Syndicate. It is up to you to take down Mr. X once and for all!.
5G - Wield the pipe in single-player or co-op mode.
5G - Wield the knife in single-player or co-op mode.
15G - Kill 10 enemies without losing your weapon.
10G - Beat the first boss without dying.
10G - Beat the fourth boss.
10G - Beat another player on Xbox Live in a versus match.
5G - Beat 10 opponents on Xbox Live in versus mode.
10G - Complete an online co-op game.
25G - Score 800,000 points in one game -- with Game Settings set to Hardcore.
30G - Defeat boss Jet -- with game settings on Hardcore.
35G - Beat the game without using a special attack.
40G - Beat the game without continuing.