Hey everyone! Duet is (finally) coming to Steam in August 2015! (That's next month!)
Good news: We've added support Steam Achievements, Leaderboards, Trading Cards and controller support.
Duet for Steam includes 3 different story campaigns: "Story", "Epilogue" & "Encore". Plus, there are hardcore challenges, endless modes, daily challenges and a Speed Run mode for each campaign.
The wait is nearly over!