This achievement requires you to screw seven players and the audience.
There are two ways you can set this up, depending on what browser you're using:
Firefox:
Use the Multifox add-on for the Firefox browser. Install it and each new tab opened (ctrl+T) can be assigned a different profile by clicking the fox icon in the browser in the top right corner.
Google Chrome:
Click on the person image in the very top right of your browser. Go all the way down to "manage people" and click on it, then click on "add person" in the bottom right corner. Once you click it, click an image for them then click "save" in the bottom right corner. This will open a new pop up window for that person.
I'd suggest using the Firefox method as it's easier to navigate tabs than windows, but I couldn't get it to work for some reason so I wen't with Chrome.
Regardless of what method you use, open 9 tabs or windows with these methods and join a game. You need one or two of these tabs to be in second last/last by the time round 2 starts after question number 5.
Pick the users you want to do poor with and don't ever answer a question with them. Use the remaining tabs to try and answer as many questions right as you can. When the second round starts, the players who are in last will be awarded a screw. Once the next question starts, find that player/players that have the screw and use it. It will screw all 7 other players and the audience and you'll get your achievement.