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