Here is the full list of all 33 Swamp Castle achievements.
Finish the game with a high Dark stat.
Finish the game with a high Light stat.
Win the game with the peasant background.
Become governor of Magincia.
Get into the tavern without using Stealth.
Become royalty.
Become King or Queen of the realm.
Win the guard's tournament.
Change the government of Magincia from a monarchy to a republic.
Survive a rebellion from angry peasants.
Survive two rebellions from angry peasants.
Survive three rebellions from angry peasants.
Convince the barbarians to stop raiding your lands through diplomacy.
Resolve the barbarian conflict through war.
Win the game with 0 Intelligence.
Resolve the farmer's crisis with the "dragon" in a way that everyone benefits from.
Win the game with Leadership as your highest stat.
Win the game with Strength as your highest stat.
Earn a new title among your people.
Warn the King about a conspiracy to overthrow him.
Win the game without choosing a new advisor.
Infiltrate the Thieves Guild.
Find the bandits' HQ yourself.
Become friends with the Druids.
Obtain a mysterious artifact.
Explore too far into the dark arts.
Convince someone that you are a powerful magic user.
Assassinate an important person in the kingdom.
Finish the game with 0 Agility.
Defeat a "giant."
Let the farmers own their own land.
Bluff your way out of a sticky situation.
Beat the game on Hard.