Here is the full list of all 15 Grand Pigeon's Duty achievements.
Pass really difficult level without mistakes.
Complete line of Cipher and his resistance.
Choose Cipher.
Complete line of Klaus with positive consequences.
Save the Preacher's life.
Complete line of Klaus with negative consequences.
Revenge for the death of Klaus.
Choose Klaus.
Complete line of Irwin with positive consequences.
Defeat Irwin.
Complete line of Irwin with negative consequences.
Let Irwin destroy the city.
Make a mistake in the preparation of serum.
Choose Irwin.
Don't leave the game in the initial speech Cipher and join the resistance.