Most people can't survive the hellish onslaught of Devil Daggers for more than 60 seconds. And if you watch this video, you'll understand why.
Devil Daggers, the Super Hexagon of shooters, is so difficult that the developer, Sorath, only put a single achievement in the game. It's called "Devil Dagger", and for most people, it will be impossible to attain. What's the requirement? Survive the satanic hordes for at least 500 seconds.
As of this writing, only a single player has accomplished this feat, YouTuber DraQu. Even if you've never heard of this game before, or if you haven't played it, it's worth watching his record-breaking run above. By around the 465 second mark, DraQu barely even has space to keep existing in the game. I can't even imagine getting as far as 508 seconds into the game, holy shit.
That, and, the video is also a good showcase of why this arcade-style shooter is so amazing.
As of this writing, here's the top leaderboard for Devil Daggers. You'll note that DraQu has already beaten the time from the video posted above:
It also seems like DraQu has some competition, but for now, the player can bask in the knowledge of knowing they are the only person in the entire world with this ridiculous Steam achievement. Congrats, DraQu.