Metal Gear Solid: Peace Walker Easter eggs

Unlock Monster Hunter
To Unlock Monster Hunter Missions within the game, first listen to all of Chico's Briefing files library. You can skip through these all with Circle; just make sure that the exclamation marks are all gone. These can only be unlocked after completing the mission within the area. This includes:

River Valley - Mission 5
  • The Real Basilisco
Crater Area - Mission 8
  • The Loch Ness Monster
  • Nahuelito
  • Mokele Mbembe
  • Ogopogo
Tropical Cloud Forest - Mission 10
  • Big Foot
  • Mondo Grande
Ruins - Mission 13
  • Kongamato
Mine Base - Mission 15
  • UFOs
  • Abductions
  • Elbakki
Once that has been done, start either Extra Mission [029] or [035], with Snake. When it has loaded, proceed to Playa del Alba and make your way onto the pier after receiving a codec call from Kaz. A cutscene will then start, and afterwards you will have unlocked your first Monster Hunter mission!