Ok, for this, get a friend of your team into a game. Make sure this friend is invited to your team, and that they accept the request.
To get this achievement, there must be a gold cat powerup on the crossword grid. You MUST get this gold cat powerup, and use that. Store-bought cat powerups (the red ones), won't work. Now, get your team member to make a 100 point or more word. When they do, use the cat power up, which will allow you to get points equal to the score that they got for the word. If it's over 100 points, which it should be, you'll get this achievement.
If you watch what your friend does, and check their score, you'll know when to use the power up.