Here is the full list of all 20 Kingdoms & Lords (Windows) achievements worth 200 gamerscore.
Defeat Lady of the Coast.
Have 10 campfires on the map.
Defeat Barbarian General.
Raise the population to 150.
Lose one fight.
Establish your defensive line.
Win the first fight.
Have more than 10 friends.
Complete the tutorial and the mission "The First Visit."
Defeat Duke of Cowerdon.
Defeat The Evil Monk.
Defeat Lady Bloomdale.
Defeat General McCallister.
Defeat The Stygian Witches.
Wipe out shadowy areas.
Defeat all the bosses.
Own all of the Kingdom buildings.
Successfully invade friends' kingdoms 100 times.
Successfully resist invasion 100 times.
Win 50 one-on-one battles.