If you reach certain milestones in the game, or finish off particularly tricky missions, you'll receive a special Key Item as a reward. These allow you to develop new items of equipment and cosmetic items - here's how to unlock every one of them.

Metal Gear Solid 5 Key Items locations: How to unlock all costumes and suits

KeyNotesCriteria
Children's Reward Unlocks Water Pistol Finish Mission 18
First Aid Manual Unlocks Tactial Fulton D-Dog Finish Mission 18 and search Masa Village
Master Certificate - Marking Can tell the different between enemies and decoys Mark 500 enemies
Master Certificate - Fulton Unlocks Grade 3 Fulton upgrade Extract 500 enemies
Grand Master Certificate - Fulton Unlocks F-Ballista Extract 1,000 enemies
Master Certificate - Box Unlocks C. Box (WR) Take all Invoices in Africa or Afghanistaion
Grand Master Certificate - Box Unlocks C. Box (SMK) Take all Invoices in Africa AND Afghanistan
Conch Shell Unlocks Petrol Bomb and Fulton upgrade Finish Side Op 113
Skulls Machete Unlocks Task-Arm SM Finish Mission 29
Strangelove's Memento Unlocks Bandana Finish Side Op 143
Man on Fire - Corpse Unlocks Furicorn Finish Side Op 144
Quiet's Examination Report Unlocks Gray XOF uniform Finish Mission 40 or watch Quiet's interrogation cutscene
Handkerchief Unlocks Sniper Wolf uniform Finish Mission 40
Emmerich's Research Notes Unlocks Stealth Camo Watch the exiling of Emmerch cutscene
The Codename: Big Boss Unlocks Leather Jacket uniform Finish the Phantom Pain's secret mission
Master Certificate - Standard Unlocks Cyborg Ninja uniform Finish every mission (except hardest difficulty)
Grand Master Certificate - Standard Unlocks Raiden uniform Finish every mission (except hardest difficulty) - S Rank
Master Certificate - Elite Unlocks Naked (Silver) and Bionic Arm uniform Finish all missions on Extreme, Subsistence and Total Stealth
Grand Master Certificate - Elite Unlocks Naked (Gold) uniform Finish all missions on Extreme, Subsistence and Total Stealth - S Rank
Star of Bethlehem Unlocks Infinity Bandana uniform Finish the Phantom Pain's secret mission

- You can find the rest of our Metal Gear Solid 5 walkthrough from the first page of this article.

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John Bedford

John Bedford

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John is Metabomb's Editor in Chief, and is responsible for all of the Hearthstone news, features and guides content on the site.

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