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