ties do not count towards your three wins, despite it appearing as though a tie counts as a win for both players,
this achievement is very easy to boost by yourself. you need a minimum of two players for this game. i suggest just opening up two different browsers on a PC side by side, but you can also use two phones or tablets or whatever you have available.
with two players each person gets 11 turns in a round. simply type anything, like "x", and have the second player press YES. you can have the first player press NO each time, but that's not necessary. if you only press NO once, the final score will be 11-9. at the end choose "next round", and after the same player wins three rounds in a row, the achievement will trigger. i used two browser windows (firefox and internet explorer) and it only took about 5 minutes altogether for the three rounds.
also note if you type the word "nugget" and have the other player accept it you will earn another achievement: