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