Metal Gear Solid 4 Big Boss Mask?

On Metal Gear Solid 4, how do I get the big boss mask?Metal Gear Solid 4 Big Boss Mask?
Get the big boss emblem.





Requirements:


* The Boss Extreme Difficulty


* Complete the game in under 5 hours of playing time


* Have 0 Alerts, 0 Humans killed, 0 Continues


* Use 0 Health Replenishing Items


* Do NOT use the Bandana or StealthCamo





I think that's it.Metal Gear Solid 4 Big Boss Mask?
go on game winners and it will tell you





go to PS3, and then hit M, select Metal Gear Solid 4, amd it will tell you