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