Full list of all 10 HORROR OF THE DEEP achievements worth 1,000 gamerscore. It takes around 1-2 hours to unlock all of the achievements on Xbox One.
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Survive the Venomous Underpass
Discover the Gorge of the Swarm
Relax in the the Arcane Library
Survive the Basin Of Tears
Take a Break at Passage of Severance
Discover the Forbidden Crip
Explore the Auditorium of The Crip
Explore the Atrium of Renunciation
Descend into the deep