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