Here is the full list of all 18 A guard walks into a tavern achievements.
Got the main story ending: Eternal
Got the main story ending: Arrival
Got the main story ending: Unexpected Justice
Got the main story ending: No Escape
Got the main story ending: Reversal of Fate
Got the main story ending: Prophecy Fulfilled
Got the main story ending: Confused And Innocent
Got the main story ending: Insightful Person
Got the main story ending: The Return of the King
Got the main story ending: Ancient Fairy Tale
Got the main story ending: Royalist
Got the main story ending: Fart in a windstorm
Left the kingdom
Brought the little girl in Blue Crow back to life
Completed all side stories
Got fired
You died
Savings reach 10,000