Full list of all 54 Sunless Sea achievements.
The base game contains 30 achievements, and there is 1 DLC pack containing 24 achievements.
Let your terror reach 100
Let your terror reach 90
Take the Correspondent legacy
Complete the game without ever choosing a past
Take the Pupil legacy
Die 5 times in an unbroken lineage
Discover 'The Eye'
Take the Shipmate legacy
Acquire the Eschatologue-class Dreadnaught
Take the Rival legacy
Complete the game without saving manually
Send your child to zee
Spend one year out at zee in an unbroken lineage
See Hunter's Keep burn
Take the Salvager legacy
Die for the first time
Visit the Surface
Create an ironclad will
Suffer Storm's Curse
Achieve Admiralty's Favour 10
Discover The Dawn Machine
Woo a sweetheart in London
Download new stories
Die 10 times in an unbroken lineage
Spend five years out at zee in an unbroken lineage
Spend ten years out at zee in an unbroken lineage
Suffer Salt's Curse
Suffer Stone's Curse
Achieve Antiquarian 10
Recruit the imaginary officer
Discover Nook
Avoid being killed by the Unexploded Unclear Bomb
Discover Dahut
Come face to face with the Constant Companion
Discover Scrimshander
Discover Wrack
Discover Low Barnet
Perform an abyssal ritual to encounter Lady Black
Discover Undercrow
Discover Anthe
Discover Hideaway
Use an oasis to increase your oxygen levels
Discover Rosegate
Discover The Gant Pole
Discover Aigul
Escape underwater combat by resurfacing
Use underwater currents to bear you on your way
Venture beneath the waves
Die of suffocation
Be killed by an underwater creature
Be killed by the Constant Companion
Accept a power of the deep zee
Complete the Zubmariner ambition
Collect all of Drownie Love-song, Drownie Counterpoint and Drownie Hymn