Here is the full list of all 31 Kitty Powers' Matchmaker achievements.
Ask the waiter about all the dishes on all the menus
Ask the waiter about all twenty dishes on the American menu
Pair off a Glam and a Geek type
Ask the waiter about all twenty dishes on the German menu
Get walked out on 10 times
Ask the waiter about all twenty dishes on the Japanese menu
Ask the waiter about all twenty dishes on the Greek menu
Ask the waiter about all twenty dishes on the Swedish menu
Ask the waiter about all twenty dishes on the Spanish menu
Pair off a Practical and Arty type
Ask the waiter about all twenty dishes on the Jamaican menu
Pair off 3 Steam friends
Ask the waiter about all twenty dishes on the Chinese menu
Tap the cat 25 times
Pair off Kitty Powers
Find Big Head mode
Ask the waiter about all twenty dishes on the Indian menu
Pair off an Edgy and a Vintage type
Ask the waiter about all twenty dishes on the British menu
Go on 100 dates
Ask the waiter about all twenty dishes on the French menu
Pair off a Hipster and a Sporty type
Ask the waiter about all twenty dishes on the Italian menu
Spin the Wheel of Misfortune 4 times in one date and pair the couple off
Get through a date without spending money
Fail every minigame in the funniest way
Pair off a Chic and a Hippy type
Have 50 same gender relationships
Poke characters 1000 times
Have 50 babies
Get all the other Achievements