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