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