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