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