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