| Achievement | How to unlock
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| A Call to Arms | Fully upgrade a gun.
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| American Horsepower | Obtain the Mustang-11 from Gaston.
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| Avid Gun Collector | Acquire infinite ammo from the Merchant (fully upgrade all weapons).
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| Carrying the Fire | Complete chapter 3.
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| Conscientious Objector | Complete the main story without directly killing any enemies with guns, melee, grenades, or hazards.
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| Elite Trench Raider | Complete the main story without damaging enemies with guns or grenades (ending 3A, 3B, or 4 only).
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| Grognard | Achieve a new game S+ rank on Veteran, without checkpoints and unlimited saves (no ending 1A or 1B).
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| Hairy Day | Complete the main story in six saves or under and without checkpoints (no ending 1A or 1B).
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| I Shall Not Fail That Rendezvous | Complete chapter 6.
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| Indoctrinated | View all 15 pieces of propaganda.
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| Modern Warfare | Kill an enemy knight with only the knife.
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| Not Youth Any Longer | Complete the main story with an S rank on any difficulty.
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| Over by Christmas | Complete the main story in under three hours (no ending 1A or 1B).
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| Over the Top | Complete chapter 4.
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| Paths of Glory | Achieve ending 2A or 2B.
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| Poilu | Complete the main story on Veteran difficulty.
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| Rodent Prevention | Burn ten enemy corpses.
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| Sleepers of Fort Vaux | Achieve ending 1A or 1B.
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| Some Flaming Town | Complete chapter 5.
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| Standard Issue No More | Upgrade a gun for the first time
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| Stretcher Bearer | Offer medical supplies to the Medic three times in a single playthrough.
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| The Harvest of Battle | Kill 25 enemies in the trench run sequence.
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| The Sacred Way | Use the transport truck to travel to three different locations in Verdun.
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| The Trench | Complete chapter 2.
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| The War to End All Wars | Achieve ending 4 (secret ending).
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| They Shall Not Pass | Complete chapter 1.
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| Uncomfortably Numb | Obtain maximum health and stamina levels.
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| War Criminal | Kill two enemy soldiers with one shotgun blast.
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| Wartime Looter | Open a special drawer.
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| We Have So Much to Say | Achieve ending 3A or 3B.
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| What're Ya Buyin'? | Purchase your first item from the Merchant.
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| What're Ya Sellin'? | Sell more than 500 cigarettes worth of items to the Merchant.
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| Who Needs Artillery? | Kill four enemy soldiers at once with an explosive barrel.
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| Widowmaker | Refind a lost photo twice.
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