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