Here is the full list of all 27 Herald: An Interactive Period Drama - there are Book I & II achievements.
End the quarrel.
Fail to prevent a flogging.
Find the monster.
Witness a performance.
Discover the horrible truth.
Make the boatswain's favourite grub.
Read the boy's letter.
Serve the senator a highly flavoured meal.
Negotiate a compromise.
Push the boy too far.
Fail to prevent a desperate act.
Go against the captain.
Listen in on a prayer.
Betray the boatswain.
The officer gets his way.
Tell the boatswain off.
Refuse ill-gotten gains.
Save a life.
Bring food to the prisoner.
Completely blend in while serving tea.
Be consistently rude to the senator.
Remind the cook about his own pet peeve.
Find stolen goods.
Get your hands dirty.
Demand the truth.
Successfully convince the senator.
Make a sacrifice to keep order.