Here is the full list of all 20 Valiant Hearts: The Great War achievements worth 1,000 gamerscore.
Finish the game
Save Karl
Shoot the German flag with the cannon at Vimy's ridge
Escape the French army with Anna and Karl
Defeat the Baron Von Dorf
Push all the laundry bags
Finish the Douaumont Fort mission
Rescue Karl from underneath the zeppelin
Find 50 historical items
Read 30 historical facts
Complete 1 taxi mission without damaging the car
Witness the zeppelin crash
Shoot the tractor before it crushes Emile
Find 5 historical items
Pet the dog
Raise the flag at the end of the basic training
Ring the bell 3 times in Ypres
Save your entire platoon during the battle of Somme
Save Karl for the third time without making any mistakes
Find every single historical item