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