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