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