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