Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Atonement	Complete Chapter XII.
Broken Hopes	Complete Chapter X.
Bullseye!	Destroy the nest with Ewald in Chapter X.
Challenges of Chapter III	Complete all challenges in Chapter III.
Challenges of Chapter II	Complete all challenges in Chapter II.
Challenges of Chapter IV	Complete all challenges in Chapter IV.
Challenges of Chapter IX	Complete all challenges in Chapter IX.
Challenges of Chapter I	Complete all challenges in Chapter I.
Challenges of Chapter VIII	Complete all challenges in Chapter VIII.
Challenges of Chapter VII	Complete all challenges in Chapter VII.
Challenges of Chapter VI	Complete all challenges in Chapter VI.
Challenges of Chapter V	Complete all challenges in Chapter V.
Challenges of Chapter XII	Complete all challenges in Chapter XII.
Challenges of Chapter XI	Complete all challenges in Chapter XI.
Challenges of Chapter X	Complete all challenges in Chapter X.
Collectibles of Chapter III	Find all collectibles in Chapter III.
Collectibles of Chapter II	Find all collectibles in Chapter II.
Collectibles of Chapter IV	Find all collectibles in Chapter IV.
Collectibles of Chapter IX	Find all collectibles in Chapter IX.
Collectibles of Chapter I	Find all collectibles in Chapter I.
Collectibles of Chapter VIII	Find all collectibles in Chapter VIII.
Collectibles of Chapter VII	Find all collectibles in Chapter VII.
Collectibles of Chapter VI	Find all collectibles in Chapter VI.
Collectibles of Chapter V	Find all collectibles in Chapter V.
Collectibles of Chapter XII	Find all collectibles in Chapter XII.
Collectibles of Chapter XI	Find all collectibles in Chapter XI.
Collectibles of Chapter X	Find all collectibles in Chapter X.
Consequences	Complete Chapter V.
Cowardice	Complete Chapter I.
Daddy Would Be Proud	Destroy the nest with Rubble in Chapter X.
Eat Lead!	Kill 250 officers.
Explorer	Find a collectible.
Food Massacre	Kill 20 dogs with poisoned sausage.
Helping Hand	Heal any hero with Greta.
Here Comes the Boom	Kill 100 soldiers using Ewald's Brawl.
Heroism	Complete Chapter IV.
Hold a Door	Kill 3 soldiers at once by breaking down the door.
It Will Rain	Kill 10 soldiers at once with one grenade.
It's Just an Accident	Commit murder by unfortunate accident.
King of Knives	Kill 50 soldiers by throwing a knife.
Missing in Action	Hide 500 bodies.
NO LIFE IS WORTH SAVING...	Kill 1944 soldiers.
Not Spill a Drop	Do not use the moonshine bottle in one mission with Ewald.
Opportunities	Complete Chapter VI.
Piece of Cake	Finish all missions on hard or challenge difficulty level.
Prospector	Find 20 collectibles.
Sniper Wolf	Kill 20 soldiers with sniper rifle.
Sorrow	Complete Chapter XI.
Such is War!	Complete any mission on hard or challenge difficulty level.
The Breaking Point	Complete Chapter II.
The Difference	Complete Chapter VIII.
The Good Samaritan	Spare Joachim in Chapter XII.
The Horror	Complete Chapter VII.
The Motivation	Complete Chapter III.
Tiptoe Around	Complete the mission without alarming enemies.
Treasure Hunter	Find all collectibles.
Vengeance	Complete Chapter IX.
Warm Up	Complete one challenge.
Without a Second Thought	Kill Joachim in Chapter XII.