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.
Reach the City.
Unlock all farm buildings.
Rescue 50 Survivors.
Kill 10 enemies using the Soldier's Flame Thrower.
Get poisoned 10 times.
Heal 20 times using the Nurse.