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https://www.trueachievements.com/a16855/aperture-science-achievement
https://steamcommunity.com/discussions/forum/1/626329187048909654/
https://steamcommunity.com/sharedfiles/filedetails/?id=132082464
https://strategywiki.org/wiki/Portal/Challenges
https://theportalwiki.com/wiki/Obtaining_Portal_achievements
https://theportalwiki.com/wiki/Achievements
https://www.xboxachievements.com/forum/showthread.php?t=65336
https://steamvr.com/id/Daniilblag/stats/400/achievements/
https://gamefaqs.gamespot.com/boards/934384-the-orange-box/49686377
https://www.reddit.com/r/Portal/comments/v5k68/portal_aperture_science...
https://www.exophase.com/game/portal-steam/achievements/
https://combineoverwiki.net/wiki/The_Orange_Box_Achievements
http://astats.astats.nl/Astats/Steam_Game_Info.php?Tab=2&AppID=400&Ste...
https://justtwovideogamers.com/2016/08/07/portal-achievement-guide/
https://www.gamesradar.com/cheats/11390/
Co-Authored By:
2020-11-29