A Reddit user going by m0rpheus23 just dropped something that sits firmly at the intersection of two passionate but niche communities: achievement hunters and Linux gamers. The tool is called Sentinel, and it adds a fully functional achievement system to games played outside of Steam on Linux.
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What Sentinel actually does
The concept is straightforward. After downloading Sentinel from GitHub, you point it at either the Steam Web API or an external source like SteamHunters. The tool pulls achievement data from whichever source you choose, then monitors your save files in real-time, cross-referencing progress against that data. When you hit the trigger condition, the achievement fires.
A GIF shared on the project's GitHub shows it working live in Middle-earth: Shadow of Mordor, with an achievement unlocking the moment an arrow hits a fire pit. That is not a delayed sync or a manual check. That is real-time detection doing exactly what it promises.
Sentinel was built specifically for games downloaded outside of Steam. If you are running titles through Heroic Launcher (which handles your Epic Games Store library on Linux), Sentinel tracks those too. You get on-screen notifications, multi-step achievement tracking, global completion percentages when using the Steam API, and even custom notification sounds if the default ping does not do it for you.
The achievement hunting community is bigger than you think
This might look like a tool for a tiny audience, but achievement hunters are a surprisingly dedicated group. RetroAchievements, a platform that adds achievement support to classic retro games, has been running for 14 years and now covers over 10,000 games with nearly 600,000 individual achievements. That is a real, active community built entirely around the idea that games are more satisfying with goals attached.
Steam, Xbox, and PlayStation all lean into this with their own systems, and the dopamine hit of that notification sound has genuine psychological pull. Sentinel extends that system to a corner of gaming where it did not previously exist.
Where this goes next
Beyond achievements, Sentinel doubles as a game library tracker, pulling your titles together with their achievement progress in one place. That alone makes it a useful organizational tool for anyone running a mixed library across Steam and other storefronts on Linux.
The creator has also flagged plans to bring Sentinel to Steam Deck, which would extend its reach considerably. The Steam Deck runs on Linux under the hood, and its players are exactly the kind of audience who would want this. You can check out the SamRewritten GitHub for a look at how similar achievement management tools have approached the Steam ecosystem, which gives useful context for where Sentinel sits in this space.
For Linux gamers who have felt like second-class citizens when it comes to achievement support outside of Steam's own library, Sentinel is a practical fix built by someone who clearly wanted it to exist. Keep an eye on the project's GitHub for Steam Deck updates as development continues. Make sure to check out more:
