| Achievement | How to unlock
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|---|
| A Country Without An Army (10 points) | Cleared Chapter 1: A Country Without An Army.
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| A Nation Reborn (10 points) | Cleared Chapter 3: A Nation Reborn.
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| An Army Without Borders (10 points) | Cleared Prologue: An Army Without Borders.
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| Basilisk Eater (30 points) | Defeated Pupa, Chrysalis, Cocoon, Peace Walker.
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| Completed ZEKE (50 points) | Customized ZEKE's head parts and foot parts with special AI weapon parts.
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| Failed again, did you? (10 points) | Reached 50 or more game overs.
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| Gives me infinite ammo (30 points) | Never worry about running out of bullets ever again.
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| I'm dead serious (10 points) | Threw a chaff grenade at ZEKE (single player only).
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| Kuwabara, Kuwabara (10 points) | Listened to radio near ghost.
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| Launched ZEKE (20 points) | Completed Metal Gear ZEKE.
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| MAIN OPS All Rank A (20 points) | Cleared all MAIN OPS missions at Rank A or higher.
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| Outer Heaven (10 points) | Cleared Chapter 5: Outer Heaven.
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| Stealth camouflage (30 points) | Never worry about being detected ever again.
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| Steel Eater (50 points) | Defeated all AI weapons.
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| The Illusion of Peace (10 points) | Cleared Chapter 4: The Illusion of Peace.
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| The Phantom Hero (10 points) | Cleared Chapter 2: The Phantom Hero.
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| There's nothing else you can do? (10 points) | Rolled 100 times or more in a single mission.
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| Vic Vos (50 points) | Reached a total of 20,000 or more Camaraderie.
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| You're pretty good (20 points) | Shot enemy right in the middle of the rear end.
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| Achievement | How to unlock
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|---|
| Big Boss (50 points) | Clear all MAIN OPS and EXTRA OPS missions at Rank S.
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| CQC Six Shot (20 points) | Perform CQC six times in a row.
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| Costume Collector (30 points) | Obtain every costume.
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| Deliverer (20 points) | Exchange items back and forth with another player using Delivery.
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| Divine Wind (20 points) | Collect a soldier using a divine wind.
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| EXTRA OPS All Cleared (20 points) | Clear all EXTRA OPS missions.
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| EXTRA OPS All Rank A (30 points) | Clear all EXTRA OPS missions at Rank A or higher.
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| EXTRA OPS All Rank S (50 points) | Clear all EXTRA OPS missions at Rank S.
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| Elite Forces (30 points) | Clear "Capture the Enemy Base 06" in OUTER OPS using only soldiers.
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| Fulton Recovery Veteran (10 points) | Reach 300 or more Fulton recoveries.
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| Hideo Kojima (10 points) | Recruit Hideo Kojima.
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| Hold-Up Artist (10 points) | Reach at least 100 hold-ups.
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| Huey's Thoughts (10 points) | Read Huey's love letter.
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| I feel... safe (10 points) | Put on a cardboard box.
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| Indirect Attack (10 points) | Attack enemy soldiers by blowing up an oil drum or truck (single player only).
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| Kaz Mania (20 points) | Obtain Rank S on a date with Kaz.
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| Leap of Faith (10 points) | Perform a Leap of Faith and obtain the Assassin's Straw Box.
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| Lethal Enforcer (10 points) | Reach at least 100 kills.
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| MAIN OPS All Rank S (30 points) | Clear all MAIN OPS missions at Rank S.
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| Mech Catcher (10 points) | Capture a mech.
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| Monster Hunter (20 points) | Clear all hunting quests.
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| OUTER OPS Sortie (10 points) | Carry out a mission in OUTER OPS.
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| Paz Mania (20 points) | Obtain Rank S on a date with Paz.
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| Paz's Thoughts (20 points) | Read all of Paz's diary.
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| Special Staff Recruiter (20 points) | Assemble all special staff members.
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| Strangelove's Thoughts (10 points) | Read all of Strangelove's memoirs.
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| Stun Specialist (10 points) | Reach at least 100 stun attacks.
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| That looks tasty! (10 points) | Nicely cook a ration.
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| Trader (10 points) | Carry out a trade.
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| VERSUS OPS All Rules (10 points) | Play using all of the rules in VERSUS OPS.
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| Vic Boss (50 points) | Clear every achievement.
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