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