I finished the Talos Principle earlier. FUCKING AMAZING GAME, pretty hard though. Of the three possible endings only 1 pissed me off, 1 was boring, and the last was really badass. If you want the game and the best ending, ignore Elohim, go up the tower. You can always go back and get the other endings anyway. I'm probably going to play through it 2 more times (for a achievements and such) then start speedrunning/routing it.
Badass ending would be like 90% and you go up the tower and win
Boring ending is 100% but you end underneath the tower, even tho you need to get to the 5th level of the tower.
The ending that pissed me off isn't even an ending technically. You just get sent back to the start of the game. You could count it as when you click on the terminal but I don't really know.
The only real difference between the Badass and Boring is that Boring you need to find 30 stars all around the game and then solve 9 more puzzles, and 4 tetromino puzzles, although the badass one has 5~ puzzles boring doesn't. and in Badass you just need to get all the (non bonus) sigils and tower climb.
Badass would absolutely be faster, those stars are really hard to get.
Regardless of ending you need to complete what feels like over 100 puzzles. So probably like a 4-5 hour speedrun with flawless execution and I don't know of any glitches