Complete the indicated task to unlock the achievement.

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