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