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I finished Portal 2 and now I'm doing the achievements. How do I return to the place in which you get the "You Made Your Point" achievement? I tried with the dev console and it gets me to the right level, but I can't get the achievements. Are they like one-time-only achievements?

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As soon as you use the console to cheat your way in the game, the game disables achievements. – DrFish Apr 19 '12 at 18:00
@Bora I don't think using the console disables achievements, but rather specific uses can. I recall someone saying that either map <mapname> or changelevel <mapname> breaks achievements while the other is OK. – Nick T Apr 19 '12 at 19:01
@NickT That's exactly what I meant. – DrFish Apr 20 '12 at 7:14

If you've completed the game, you should be able to select "New Game" from the main menu and jump to the start of any chapter. This should make it easier to get to specific test chambers.

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Turning on sv_cheats via the dev console immediately disables achievements.1 Try save/loading or restarting the game after disabling sv_cheats before attempting the achievement. You'll also want to use map instead of changelevel, or achievements will be nullified.2

Re-loading Chapter 8 from "New Game" is another option, but the dev console is more adventurous.

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A reload won't do. You will have to restart the whole game. – DrFish Apr 20 '12 at 7:15

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