What kind of sorcery is this? Didn't know there was this kind of cheating.

Steam achievement manager, if steam would care they would need to ban like half their users

No, they simply use SAM (Steam Achievement Manager). It allows you to unlock all achievements at the same time.

Only place that will care about it is place like AStats. They will be marked there as a cheater.

Edit: 22.734 invalid achievements. :lol:

Are you sure you didn't send him an achievement spam game where the achievements all unlock after a minute?

Some people care a lot about achievements. I don't get it... but to each his/her own, I guess.

In this regard consoles are better. Can't cheat for achievement.

That's really unfortunate. I don't think you can report them, and not sure what you would report them for - cheating at achievements? I don't think it's actually against SG or Steam rules.

If you'd like your games to actually be played, I highly recommend Playing Matters. They check each member to make sure that they do, in fact, play their games, and that they don't use any methods to cheat their achievements to make it look like they do. And if you don't want to join yourself, you can still contribute giveaways with the knowledge that they'll go to someone that will play them.

Like others mentioned, they are using SAM to unlock achievements. You don't need to report it here, and I'm almost sure Valve doesn't forbid it either, the only places where you could report this are achievement trackers like AStats, TrueSteamAchievements and such.

Since you've had some answers and it's really easy to identify the user, I'll close the thread to avoid that it turns into a witch hunt.