This achievement requires you to win a game of Blather Round as the audience.
The fastest way is to simply open up 3 tabs using google chrome using the below method:
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.
Join in with two tabs and start the game, then join in as the third tab and it will be placed in the audience. Now go through picking your phrase and hints, then once the game starts, guess the correct answer as the audience and let the timer run out. The two in-game players will get 0 points and the audience will get 500. Repeat this for the remaining question in this round and both questions in round 2 for and the audience will end up with 3000 points. You'll unlock the achievement when the game announces the winner.