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