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