Here is the full list of all 11 Manor Lords achievements.
Big success!
Face the winter and have your settlers not abandon you.
Defeat the baron in the "Restoring the peace" scenario.
Get to a "small town" settlement level without hunting or gathering berries.
Employ 24 retainers.
Change the church bell sound.
Reach 100% approval in a "large town".
Destroy a squad of brigands with a squad of militia in a non battle game mode.
Beat "Restoring the peace" with Mercenary units only.
Beat "Restoring the peace" on "Challenging" difficulty preset.
Finish the "Restoring the peace" scenario