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