Here is the full list of all 19 Pigeon Fight achievements.
Eat 1000 pieces of bread
Infect 500 pigeons
Wear crown 500 times
Be infected a total of 2000 seconds
Hold royal status totaly of 1000 seconds
Peck other pigeons 1000 times
Do 1000 poops
Have hydrocephalus around 1000 seconds
Win "Pigeon Fever" mode with 0.50 seconds or less left
Slip on 5 poops in a row, one by one
Finish "Bread Hunt" mode in a minute or less when all pigeons are enabled
Finish "King of Pigeons" mode when you are have crown all time with all pigeons are enabled
Finish "Bread Hunt" mode without players
Finish "Pigeon Fever" mode without players
Finish "King of Pigeons" mode without players
Finish "Bread Hunt" mode 10 times when only one player is controlled by you
Buy 10 items in shop
Buy 50 items in the shop
Start your first match