Here is the full list of all 10 The Scorchfarer achievements.
Find the secret terrace
Visit Olhum at the map screen in the Journal
Ask about all the objects and places of interest in the first episode
Ask about the world around you 30 times
Complete the first episode: 'The Wanderer and the Anchor'
You've gained an unconventional ally
Ask about the world around you 10 times
Find the map of the world
Complete the prologue
Ask about the world around you 5 times