To get fast clicks for achievements like clicking 666 times, I would recommend using an auto-clicker to make the process a whole lot faster and easier.
You quit the game...- Simply press quit button after you see it. Once you open the game, the achievement shall unlock.
Clicked to 666- As mentioned before, use an auto-clicker for this one. Avoid clicking the quit button. Once you get 666 clicks the achievement shall pop up.
Clicked to 13- Click 12 times and wait for 5 minutes. After 5 minutes, the click should be 0 now. Click 13 times and you see the number 13. Achievement shall pop up.

Thanks for reading my guide and I hope it helped!
Huge thanks to Klumb3r for giving me information on "Clicked to 13" achievement.
Feel free to leave a comment if you need help.

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