Here is the full list of all 8 Plague Road trophies - there are 4 bronze, 2 silver and 2 gold.
Finish the True Ending.
Discover the Catacombs.
Kill 10 enemies using the Soldier's Flame Thrower.
Reach the City.
Rescue 50 Survivors.
Get poisoned 10 times.
Unlock all farm buildings.
Heal 20 times using the Nurse.