Big Boss comment...
	Birthday party...
	Chicken Hat...
	Get Kojima As A Crew Member...
	Hideo Kojima references...
	Items...
	Metal Gear Solid 1 Snake...
	Mother Base persons...
	Prequel bonuses...
	Various Achievements...

During Mission one Save Miller. He will request the magic words. Press Triangle, and Big Boss will say, "Kept you waiting, huh?".

You will be asked to enter your birthday when initially beginning with the game. When the game is used that date, there will be a birthday celebration thrown for you at Mother Base, with a cake and some cigars.

When you die several times in short order, you'll gain the option to equip a special piece of gear called the Chicken Hat. While this is equipped, enemies won't engage with you no matter how obvious you make your presence. Instead, they'll pass out while standing. However, it only works three times in a given mission before disappearing on the fourth use, and you won't be able to rank higher than "A" on that particular run. You can enable or disable the special gear from the Options menu, while the game is paused.

Upload your save file from MGSV: Ground Zeroes to get Hideo Kojima in your crew in The Phantom Pain.

After getting rescued during your first encounter with the Man on Fire in the Prologue, follow the person down a corridor. Use the rail to your left to pull yourself up from the floor. Look closely at the bulletin board on the wall to see a poster that mentions Kojima Productions and inviting you to "Join the Fox Team". The booth number listed, CP 2308, is the actual number of the booth used by Kojima Productions at GDC 2013. You can rescue Hideo Kojima during the Side Op 112 Intel Agent Extraction mission. After doing so, he will return to Mother Base.

Complete the indicated task to unlock the corresponding item. Then enter your iDroid's "Development" menu to get the item after meeting any other requirements.

Item	How to unlock
Bandana	Complete Side Op 143.
F-Ballista (D-Walker)	Extract 1,000 enemies.
Furicorn Uniform (D-Horse)	Complete Side Op 144.
Gray Fox (1998) Uniform	Complete all missions, except the High Difficulty missions.
Gray XOF Uniform (Quiet)	Watch Quiet's Interrogation Scene.
Hand of Jehuty	Complete Side Op 49.
Infinity Bandana	Complete Mission 46.
Leather Jacket Uniform	Complete Mission 46.
Naked Gold Uniform	Earn an "S" rank on all High Difficulty missions.
Naked Silver Uniform	Complete all High Difficulty missions.
Raiden Uniform	Earn an "S" rank on all main missions, except the High Difficulty missions.
Silver Bionic Arm	Complete all High Difficulty missions.
Sniper Wolf Uniform (Quiet)	Complete Mission 40.
Stealth Camo	Complete Huey Emmerich's storyline.
Tactical Fulton Unifrom (D-Dog)	Find the First Aid Manual Blueprint at Masa Village in Central Africa.
Water Pistol	Complete Mission 18.
Wormhole Fulton	Complete Side Op 50.

To unlock the Metal Gear Solid 1 Snake camo, one much import their Ground Zeroes to Metal Gear Solid V and must have beaten the mission "Deja Vu" on hard in Ground Zeroes. This camo turns Snake into a polygonal version of "Solid Snake" from Metal Gear Solid 1. This camo gives the same bonuses that the "Sneaking Suit" provides.

Rescue Persons of Interest and Prisoners of War in Metal Gear Solid 5: Ground Zeroes and upload that saved game file. Download that saved game file from the main menu in Metal Gear Solid 5: The Phantom Pain to obtain numerous benefits. Individuals you saved will appear at Mother Base as one of your benefits. Individuals that will appear are as follows.

Assassin Harrier: Appears affter two of either Missions 7, 8, or 9.
Bitter Centipede: Appears following Mission 12.
Blue Chameleon: Appears following Mission 6.
Crying Sturgeon: Appears after two of either Missions 7, 8, or 9.
Eye: Appears following Mission 6.
Finger: Appears following Mission 6.
Frigid Mongoose: Appears after two of either Missions 7, 8, or 9.
Gray Wallaby: Appears following Mission 6.
Grizzly Hedgehog: Appears following Missions 3, 4, and 5.
Hideo: Diplomat who appears following Missions 3, 4, and 5.
Hungry Crocodile: Appears following Missions 3, 4, and 5.
Hunting Stallion: Appears after two of either Missions 7, 8, or 9.
Mad Wallaby: Appears after two of either Missions 7, 8, or 9.
Midnight Mastiff: Appears following Mission 6.
Night Tree Frog: Appears following Mission 12.
Ochre Chameleon: Appears following Missions 3, 4, and 5.
Pirate Capybara: Appears following Mission 12.
Roaring Capybara: Appears following Mission 12.
Wild Harrier: Appears following Missions 3, 4, and 5.
Wild Stallion: Appears after two of either Missions 7, 8, or 9.

Import a saved game file from Metal Gear Solid 5: Ground Zeroes to get the following rewards.

Gold Bionic Arm; only if the saved game file was created after completing Mission 5 "Over the Fence" and rescuing the Bionic Engineer.
Ground Zeroes Sneaking Suit; available as a special upgrade through the Mother Base.
Hideo Kojima in your crew.
Metal Gear Solid 1 Skin; Snake appears similar to how he was featured in Metal Gear Solid on the original PlayStation version.

Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock
Accomplished (30 points)	Complete all missions.
Achieved (30 points)	Complete all SIDE OPS.
Apprentice (15 points)	Complete a mission using a Combat Unit staff member.
Architect (30 points)	Construct all available platforms for Mother Base.
Army (35 points)	Raise all Teams/Units to level 99.
Awakening (15 points)	Complete "PROLOGUE: AWAKENING" mission.
Battalion (15 points)	Increase Mother Base staff to 250 or more personnel.
Beekeeper (15 points)	Complete "WHERE DO THE BEES SLEEP?" mission.
Captured (15 points)	Capture an outpost or guard post.
Caravan (15 points)	Complete "TRAITORS' CARAVAN" mission.
Cleared (15 points)	Complete all "Mine Clearing" SIDE OPS.
Collector (30 points)	Obtain all blueprints and key items.
Conservation (30 points)	Extract all wild animal species.
Cry Havoc (15 points)	Make D-Dog available for deployment.
Deployment (30 points)	Complete all key Dispatch Missions.
Deterrence (15 points)	Develop a nuclear weapon.
Disappearance (30 points)	Complete "CLOAKED IN SILENCE" mission.
Disarmament (15 points)	Dispose of a nuclear weapon.
Elite (85 points)	Complete all missions with an S rank.
Enhancement (15 points)	Develop 50 or more development items.
Executed (30 points)	Complete all mission tasks.
Extraction (15 points)	Fulton extract an enemy soldier.
Gears Turn (15 points)	Complete "HELLBOUND" mission.
Hero (30 points)	Obtain the codename "Hero."
Immortal (15 points)	Complete "METALLIC ARCHAEA" mission.
Interrogation (15 points)	Interrogate an enemy soldier.
Intruder (15 points)	Play an "Infiltration" FOB mission.
Locked and Loaded (85 points)	Develop 300 or more development items.
Man's Best Friend (15 points)	Raise bond with D-Dog to the maximum.
Phantom Limb (15 points)	Complete "PHANTOM LIMB" mission.
Platoon (15 points)	Increase Mother Base staff to 50 or more personnel.
Prosperity (15 points)	Earn a total of 10,000,000 GMP or more.
Reinforcement (30 points)	Develop 100 or more development items.
Reminiscence (15 points)	Obtain all memento photos.
Search-and-Destroy (15 points)	Capture all outposts and guard posts in Northern Kabul, Afghanistan.
Skull (30 points)	Complete "SAHELANTHROPUS" mission.
Speechless (15 points)	Make Quiet available for deployment.
Sweep-and-Clear (15 points)	Capture all outposts and guard posts in the Angola-Zaire Border Region.
To The Rescue (15 points)	Extract a female prisoner.
Trusty Steed (15 points)	Raise bond with D-Horse to the maximum.
Truth (30 points)	Complete "TRUTH: THE MAN WHO SOLD THE WORLD" mission.
Undertaken (15 points)	Complete a SIDE OP.
Voices (15 points)	Complete "VOICES" mission.
War Buddy (15 points)	Raise bond with Quiet to the maximum.