Single-player games like The Expanse: Osiris Reborn
Below are 12 single-player Steam games similar to The Expanse: Osiris Reborn, ranked by player overlap. Every pick carries Steam's Single-player category, so multiplayer-only titles or always-online games don't sneak in. imho.run pulls the category data from Steam directly — Single-player here matches what the store labels.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like The Expanse: Osiris Reborn page.
Ranked picks
- 1
PRAGMATA
Single-player alternative to The Expanse: Osiris Reborn — playable solo, no multiplayer required. Shares Action and Adventure with The Expanse: Osiris Reborn.
Pragmata is a unique, sci-fi action-adventure game from Capcom. Follow Hugh, a member of an ill-fated investigation team, and Diana, a young android, as they navigate a lunar facility taken over by rogue AI in search of a way to Earth.
- 2
Mass Effect (2007)
Single-player alternative to The Expanse: Osiris Reborn — playable solo, no multiplayer required. Shares Action and RPG with The Expanse: Osiris Reborn.
As Commander Shepard, you lead an elite squad on a heroic, action-packed adventure throughout the galaxy.
- 3
Star Control®: Origins
Single-player alternative to The Expanse: Osiris Reborn — playable solo, no multiplayer required. Shares Action and Adventure with The Expanse: Osiris Reborn.
Star Control is a space role-playing game in which you command Earth's first interstellar starship on a mission to save the Earth from hostile alien empires.
- 4
Rebel Galaxy Outlaw
Single-player alternative to The Expanse: Osiris Reborn — playable solo, no multiplayer required. Shares Action and Adventure with The Expanse: Osiris Reborn.
Out of cash, out of luck, out on the fringe. Juno Markev has a killer to tail, a debt to pay, and more trouble headed her way. Rebel Galaxy Outlaw takes place in a greasy, blue-collar world of outlaws, truckers, cops and thieves.
- 5
Dead Space™ 2
Single-player alternative to The Expanse: Osiris Reborn — playable solo, no multiplayer required. Shares Action and Adventure with The Expanse: Osiris Reborn.
Three years after the Necromorph infestation aboard the USS Ishimura, Isaac Clarke awakens from a coma, confused, disoriented, and on a space station called The Sprawl. Explore this world and its zero-g environments to discover the truth about the Unitology and its role in the Necromorph epidemic.
- 6
Mass Effect 2 (2010 Edition)
Single-player alternative to The Expanse: Osiris Reborn — playable solo, no multiplayer required. Shares RPG with The Expanse: Osiris Reborn.
Are you prepared to lose everything to save the galaxy? You'll need to be, Commander Shepard. It's time to bring together your greatest allies and recruit the galaxy's fighting elite to continue the resistance against the invading Reapers.
- 7
Dead Space (2008)
Single-player alternative to The Expanse: Osiris Reborn — playable solo, no multiplayer required. Shares Action and Adventure with The Expanse: Osiris Reborn.
You are Isaac Clarke, an engineer on the spacecraft USG Ishimura. You're not a warrior. You're not a soldier. You are, however, the last line of defense for the remaining living crew.
- 8
Warhammer 40,000: Space Marine 2
Single-player alternative to The Expanse: Osiris Reborn — playable solo, no multiplayer required. Shares Action and Adventure with The Expanse: Osiris Reborn.
Embody the superhuman skill and brutality of a Space Marine. Unleash deadly abilities and devastating weaponry to obliterate the relentless Tyranid swarms. Defend the Imperium in spectacular third-person action in solo or multiplayer modes.
- 9
Pathfinder: Wrath of the Righteous - Enhanced Edition
Single-player alternative to The Expanse: Osiris Reborn — playable solo, no multiplayer required. Shares Action and Adventure with The Expanse: Osiris Reborn.
Embark on a journey to a realm overrun by demons in a new epic RPG from the creators of the critically acclaimed Pathfinder: Kingmaker. Explore the nature of good and evil, learn the true cost of power, and rise as a Mythic Hero capable of deeds beyond mortal expectations.
- 10
Warhammer 40,000: Rogue Trader
Single-player alternative to The Expanse: Osiris Reborn — playable solo, no multiplayer required. Shares Action and Adventure with The Expanse: Osiris Reborn.
Made in a close partnership with Games Workshop, Warhammer 40,000: Rogue Trader is a story-rich classical RPG from Owlcat Games, developers of the critically acclaimed game, Pathfinder: Wrath of the Righteous.
- 11
Pathfinder: Kingmaker — Enhanced Plus Edition
Single-player alternative to The Expanse: Osiris Reborn — playable solo, no multiplayer required. Shares Adventure and RPG with The Expanse: Osiris Reborn.
Pathfinder: Kingmaker - Enhanced Plus Edition is the first isometric party-based cRPG set in the Pathfinder fantasy universe. Enjoy a classic RPG experience inspired by games like Baldur's Gate, Fallout 1 and 2 and Arcanum. Explore and conquer the Stolen Lands and make them your kingdom!
- 12
Warhammer 40,000: Dark Heresy
Single-player alternative to The Expanse: Osiris Reborn — playable solo, no multiplayer required. Shares Adventure and RPG with The Expanse: Osiris Reborn.
Become an acolyte of the Inquisition in this grim dark, party-based, story-driven cRPG. Lead investigations, uncover grand conspiracies, master tactical combat, and wage a secret war against heresy. Make tough choices as a conduit of the God-Emperor’s will.