Here is the full list of all 18 World War Armies achievements.
Gain the Corporal rank
Gain the Sergeant rank
Gain the Sergeant First Class rank
Gain the Master Sergeant rank
Gain the Second Lieutenant rank
Gain the First Lieutenant rank
Gain the Captain rank
Gain the Major rank
Gain the Lieutenant Colonel rank
Gain the Colonel rank
Gain the Brigadier General rank
Gain the Major General rank
Gain the Lieutenant General rank
Gain the General rank
Gain the Field Marshal rank
Pass the first training mission
Gives the player who changed the language to each of the possible languages in the game
Challenge. Sweet pill for those who get into a battle with an overpowered opponent