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