I hate to be the guy to throw someone randomly into the spotlight but I found someone who apparently has (and completed) the game early. On Xbox.com, you could see the achievements he/she has unlocked, the official game title "DmC Devil May Cry", etc. It appears they had the game since January 3rd and completed it just yesterday. Here is the link:
https://live.xbox.com/en-US/Profile?gamertag=Redriceman82
Try not to kill him guys
EDIT: Also, here is the achievement gathering the total players tracked who unlocked what achievements:
http://www.trueachievements.com/DmC-Devil-May-Cry/achievements.htm
https://live.xbox.com/en-US/Profile?gamertag=Redriceman82
Try not to kill him guys

EDIT: Also, here is the achievement gathering the total players tracked who unlocked what achievements:
http://www.trueachievements.com/DmC-Devil-May-Cry/achievements.htm