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