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The Callisto Protocol™

Also known as The Callisto Protocol™, callisto protocoltm, cp

Survive to escape the horrors of Callisto and uncover the dark secrets of Jupiter’s dead moon.

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Last update
20 May 2026
Players now
38
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1
Latest update
Event

Free Gore Skin Collection for ALL Players!

To thank our fans, all current and future owners of The Callisto Protocol receive the previously Twitch-exclusive Gore Skin Collection, for free. Additionally, all current and future owners of the Digital Deluxe Edition…

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Browse past updates and patch notes for this game.

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Achievements

Community progression

Top picks from 46 Steam achievements, sorted by player unlock rates.

  • The Outer WayHidden91.1%
  • Desperate TimesHidden88.4%
  • Flesh WoundHidden87.0%
  • Paper JamsPrint a weapon for the first time75.9%
  • ReforgedPrint a weapon upgrade70.0%
  • If the SHU Fits...Hidden65.0%