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If achievement completion is such a concern to you, then use SAM to unlock all the achievements in the game's you didn't like. Otherwise you are just going to have to accept not having 100% or play through the games anyway to complete the achievements normally.
If you try playing such a game but stops before getting a single achievement, pretty sure it will still not count in your completion rate.
As soon as you get the first achievement in a game, it will affect your completion rate. There's no way to undo that.
If Steam just cleared the achievements from their end you could end up with either:
1. The game re-awarding the achievements the next time it's run or,
2. The game never re-awarding the achievements because it believes it has already successfully awarded them.