Here is the full list of all 20 Brunch Club achievements.
Compete in the arena in Riceball Rumble
Complete Now You Sashimi on Hard Difficulty
Complete Game of Cones on Hard Difficulty
Complete Mean Grills on Hard Difficulty
Fail 25 times overall
Complete Toastal Recall on Hard Difficulty
Complete a match of Face Off
Knock over and empty 10 Salt and Pepper shakers
Complete Fry Hard on Hard Difficulty
Complete all levels on Easy Difficulty
Complete With A Vengeance on Hard Difficulty
Complete Scone In 60 Seconds on Hard Difficulty
Cook 50 Burgers
Cook 50 Hotdogs
Butter 50 slices of Toast
Empty 10 Soy Bottles
Fail 50 times overall
Fail 100 times overall
Play the game on October 3rd
Play Mean Grills on a Wednesday