Cookies on Acheev

We use cookies and similar technologies for the things below. You can accept all, reject everything except what's essential, or pick what you're OK with.

Preferences
Remembers things like your last workspace and how you had a list sorted. Improves the experience but the site works without.
Improvement
Anonymous usage measurement so we can fix bugs and prioritise work.
Marketing
Lets us measure whether ads we run send people who actually use the site. We don't share personal data with advertisers.

Read our cookies policy and the privacy policy. California residents: Do Not Sell or Share My Personal Information.

Loading…
logo
Sign in
Cthulhu: The Cosmic Abyss cover

Cthulhu: The Cosmic Abyss

Achievement guide · roadmap · tracker

A mining station in the Pacific abyss is no longer responding. As an investigator of the occult, unravel the mysteries of the deep. Test your wits and sanity in this thriller inspired by the master of Providence.

Adventure Science fiction Horror Thriller Mystery
2026 ★ 70 27 achievements Guide 0%
Steam

Track your progress

Sign in with Steam or Xbox to mark off unlocks, filter what's left and showcase your 100%s.

  • Live unlock status per achievement
  • Hide-unlocked filter
  • 100% showcase on your profile
Sign in
Help improve this guide
Sign in to request a guide
27 achievements
The Awakening

The Awakening

Inspector

Inspector

Find 10 sub-clues by inspecting objects.

Let there be light

Let there be light

Artist

Artist

The Excavation

The Excavation

Thanks Key

Thanks Key

Analyze 25 clues

Cthulhu fhtagn

Cthulhu fhtagn

Macro waves

Macro waves

Reveal 25 different clues using sonar frequencies.

The Temple

The Temple

The Other World

The Other World

Addicted

Addicted

Use 10 doses of Lichen.

The Citadel

The Citadel

In deep waters

In deep waters

Linguist

Linguist

Beyond the senses

Beyond the senses

Open Sesame

Open Sesame

Elementary

Elementary

Solve 15 deductions.

His master's voice

His master's voice

Against the tide

Against the tide

Where am I?

Where am I?

Cosmic Abyss

Cosmic Abyss

Replace the watcher.

The Last door

The Last door

A new watcher

A new watcher

Better than Pandora

Better than Pandora

Mens sana

Mens sana

Finish the game without exceeding the corruption threshold.

Full charge

Full charge

Find all energy upgrades.

Augmented agent

Augmented agent

Find all evolutions.

Related games

Vampire: The Masquerade - Swansong
Vampire: The Masquerade - Swansong
37 achievements
The Council
The Council
42 achievements
The Council - Episode 1: The Mad Ones
The Council - Episode 1: The Mad Ones
43 achievements
RoboCop: Rogue City
RoboCop: Rogue City
Warhammer: Chaosbane
Warhammer: Chaosbane
45 achievements
Hell is Us
Hell is Us
Steelrising
Steelrising
55 achievements
The Lord of the Rings: Gollum™
The Lord of the Rings: Gollum™
Bee Simulator
Bee Simulator
51 achievements
RoboCop: Rogue City - Unfinished Business
RoboCop: Rogue City - Unfinished Business
Roguebook
Roguebook
61 achievements
Ad Infinitum
Ad Infinitum
29 achievements

Explore more lists

Best Adventure Games for Achievements Best Steam Games for Achievements Easiest Games to 100% Complete Games with the Most Achievements Rarest Achievements