Here is the full list of all 11 Drunkn Bar Fight trophies - there are 7 bronze, 3 silver and 1 gold.
Hit AI character in nuts
Hit an AI character in the eye with a dart
Change the radio station
Hit an AI character up in the air and punch him before he lands
Use bat on opponent
Throw up over side in rooftop
Use fire extinguisher
Drop lights on opponent in Saloon
Hit opponent with cork from champagne
Send opponent off building
Throw opponent into other opponents