for this achievement, all you have to do is win a game! however, if you struggle to win, here are some tips:
Combo's: a entire game will take multiple rounds, remember what setnece you made in round one, because if use a same target, you'll get bonus points.
Example:
round 1: your father is your mother
round 2: your father is a Parrot
in round 2 you used "your father" for the second time, and it will give bonus points.
a long sentence: Longer sentences will allow for easier combos down the line and give you quite a few points early on
Example:
"You" "and" "your mother" "and" "your teacher" "were born in" "a public loo"
you'll get points for:
"you are born in a public loo"
"your mother is born in a public loo"
"your teacher is born in a public loo"
giving you points 3 times with combo options for "you" "your teacher" "your mother" and "a public loo" in the next round
using sentence finishers: using a last little line like "... and you can't deny it" or even a simple "mister" or "honey" will score bonus points
Now go out there and insult everyone you can... in game of course
Happy hunting, and good luck!