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My brother has played Portal 2 on my account and got a decent chunk of the achievements without specifically trying for them. Shamefully, I haven't yet played it, but I want to of course. I really enjoyed getting all the achievements in the first game and want to try for them in the second, but I want the regular Steam alerts to show up when I get one so that I know for sure that I got it. Naturally, this won't happen for any achievements that my brother already got.

Thus my question: Can I clear Steam achievements (set them all back to unachieved), so that I'll get alerts and be able to track them properly? I know I can clear the game progress that's saved via Steam Cloud but I don't want to do that since it would destroy my brother's progress, and I know there are some issues syncing the achievements between the game and Steam anyways.

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That's too bad, and it's a shame Steam is so single-player-per-game about everything. Portal 2 has quite a lot of meta-humor in the achievements. – fluffy Nov 9 '11 at 21:45
up vote 32 down vote accepted

From the Steam FAQ:

Resetting Achievements Unfortunately, achievements can not be reset at this time.

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Too bad. Thanks though – Matthew Read Nov 9 '11 at 23:27

Using a third party program it is possible to reset your achievements as they are NOT stored server-side. Though extremely unlikely, it is possible to be banned for doing this. As of July 2015 I don't believe Steam is banning for using SAM.

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