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