This has probably been figured out forever ago but there's a way to cheese the Speedrun Achievement in the HD Remake by making a save right in front of the freedom cutscene, quitting out the game, going back in and loading said file, and then stepping right into the cutscene. It'll count towards getting the achievement and that's pretty silly, and neeat for those who don't feel like setting the achievement up the "proper" way.
The Stanley Parable Wiki