To unlock these, choose the specified phrase when starting a new game.
Unlockable
How to Unlock
AUSCAM Camo.
Choose "I like MGS1!"
Banana Camo.
Choose "I like MGS PEACE WALKER!"
Desert Tiger Camo and Raiden Mask in the intro cutscene.
Choose "I like MGS2!"
DPM Camo.
Choose "I like MGS4!"
Flecktarn Camo, Green and Brown facepaints.
Choose "I like MGS3!"
Grenade Camo.
Chose "I like all the MGS games!"
Mummy Camo.
Choose "I'm playing MGS for the first time!"
Boss Camos
If you defeat a boss by deleting its stamina gauge or other tricks, you'll unlock bonus camos with unique abilities.
Unlockable
How to Unlock
Animals Camo
Beat Ocelot by reducing his stamina gauge to zero.
Cold War Camo
Defeat Volgin by reducing his stamina gauge to zero.
Fire Camo
Defeat The Fury by reducing his stamina gauge to zero.
Hornet Stripe Camo
Defeat The Pain by reducing his stamina gauge to zero.
Moss Camo
Sneak up on The End and hold him up with a weapon.
Snake Camo
Defeat The Boss by reducing her stamina gauge to zero.
Spider Camo
Defeat The Fear by reducing his stamina gauge to zero.
Spirit Camo
Defeat The Sorrow by reaching the end of the river.
Escape The Jail Cell Easily
During the part where Snake is locked up in a jail cell, access your radio and set the frequency to 144.75. Doing so automatically unlocks the cell door.
Facepaints and Camos
Aside from the camos and paints you can find during the mission, several can be obtained after beating the game.
Unlockable
How to Unlock
AUSCAM Pattern Camo
Beat the game.
Banana Pattern Camo
Beat the game.
Brown Face Paint
Beat the game.
DPM Pattern Camo
Beat the game.
Desert Tiger Pattern Camo
Beat the game.
Flecktarn Pattern Camo
Beat the game.
Green Face Paint
Beat the game.
Grenade Pattern Camo
Beat the game.
Mummy Pattern Camo
Beat the game.
Tuxedo
Beat the game.
Figurines In Granin's Office
During the cutscene in Granin's office, use the camera to pan around the room. You'll find figurines of Metal Gear REX, Metal Gear RAY, and Jehuty, which are from the previous Metal Gear Solid and Zone of the Enders games respectively.
Guns
Gun
How to unlock
Mosin Nagant
Defeat The End by reducing his stamina gauge to zero.
Patriot
Beat the game once.
Single Action Army
Select the gun on the right during Snake and Ocelot's final duel.
Kill The End Early
After walking through the cave and the river at Ponizovje, you'll see a cutscene. As soon as the cutscene ends, equip your SVD sniper rifle and aim it at The End. If you shoot quickly and accurately enough, you can kill The End and skip his boss battle later on. There will be a platoon of soldiers to fight instead.
Reloading Faster
Some weapons, such as the RPG-7, take a long time to reload. To skip the extra reloading animations, just equip another weapon, and then immediately switch back.
Skip The Sorrow Battle
During the battle with The Sorrow, immediately lie down in the water. You'll eventually drown, thus prompting the Game Over screen. Instead of choosing the usual options, use the Revival Pill in your inventory; doing so skips the entire fight and allows you to continue the mission.
Twirl the Colt Single Action Army
Once you get the Single Action Army, you can twirl it by moving the 3DS system while in FPS aiming mode. This allows you to show off Snake's skill with a revolver and distract Ocelot during your duel with him at Bolshaya Past Crevice. When you're in the open, twirl your revolver and Ocelot will respond with his own revolver tricks and commentary.
