Full list of all 24 Banner of the Maid achievements worth 1,000 gamerscore. It takes around 40-50 hours to unlock all of the achievements on Xbox One.
Complete Chapter II.
Learn an ability in the École Militaire in Paris.
Any Character reaches Level 30.
Complete the Salon Achievement "Legion".
Complete the Salon Achievement "Star of Paris".
Complete the Salon Achievement "Les Riches".
Complete the Salon Achievement "Valorous".
Complete the Salon Achievement "Records of the Past".
Complete the Salon Achievement "Treasure of the Scholar".
Complete the Salon Achievement "Mirabeau's Story".
Complete the Salon Achievement "Story of the Fool".
Complete the Salon Achievement "Road of Thorns".
Perform a Promotion for any character.
Complete Chapter VII.
Complete Chapter XII.
Complete Chapter XVIII.
Complete Chapter XXIII.
Complete Chapter XXVIII.
Complete the Final Chapter.
Complete the main campaign in Officer or General mode.
Complete the main campaign in General mode.
Complete the challenge in Chapter V, "Heavy Fortification".
Complete the challenge in Chapter XVI, "Knight in the Deep Valley".
Complete the challenge in the side quest "Diary of the Nameless".