For this achievement we will be using 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 like so
Now you will need at least 3 tabs open, once you're in game enter your quips and make sure that they are all the same, something like 'A' for example. Once they are entered and the pick stage comes you will get a 'Jinx' round as you both had the same quip and the achievement will be yours.