Valiant Hearts: The Great War (Xbox One) – Achievement – King of The Hill
Shoot the German flag with the cannon at Vimy's ridge (Secret Achievement)
This is obtainable on Chapter 4 on the 'Vimy's Ridge' level. You will come to a point where you can adjust the direction of an artillery cannon. You are meant to change the aim to '10' to destroy one bunker and '60' to destroy the second bunker to progress with the level, however if you adjust the aim to '35' and pull the lever to fire, you will destroy a German flag, thus giving you the achievement.