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 Shipmate legacy
Send your child to zee
Suffer Storm's Curse
Woo a sweetheart in London
Take the Salvager legacy
Die 10 times in an unbroken lineage
Let your terror reach 100
Discover 'The Eye'
Visit the Surface
See Hunter's Keep burn
Let your terror reach 90
Discover The Dawn Machine
Create an ironclad will
Spend one year out at zee in an unbroken lineage
Die 5 times in an unbroken lineage
Take the Rival legacy
Achieve Admiralty's Favour 10
Take the Pupil legacy
Take the Correspondent legacy
Die for the first time
Download new stories
Spend five years out at zee in an unbroken lineage
Spend ten years out at zee in an unbroken lineage
Acquire the Eschatologue-class Dreadnaught
Suffer Salt's Curse
Suffer Stone's Curse
Achieve Antiquarian 10
Recruit the imaginary officer
Complete the game without saving manually
Complete the game without ever choosing a past
Discover Scrimshander
Discover Hideaway
Discover Nook
Discover Wrack
Discover Undercrow
Discover Rosegate
Discover Aigul
Use an oasis to increase your oxygen levels
Discover Anthe
Accept a power of the deep zee
Discover Dahut
Discover The Gant Pole
Discover Low Barnet
Come face to face with the Constant Companion
Use underwater currents to bear you on your way
Escape underwater combat by resurfacing
Venture beneath the waves
Die of suffocation
Be killed by an underwater creature
Be killed by the Constant Companion
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