Here is the full list of all 52 Cook, Serve, Delicious! achievements. It takes around 25-30 hours to unlock all of the achievements on Windows.
Served over 15,000 customers
(Extreme Difficulty) Achieve a Perfect Day with six items on your active menu
(Extreme Difficulty) Receive and read a peculiar email
(Extreme Difficulty) Survive a Super Rush Hour
(Battle Kitchen) Unlock Six Special Guests
Served over 10,000 customers
Served over 1,500 dishes of Japanese, Chinese and Asian Cuisine
Served over 1,500 dishes of delicious Breakfast foods
Served over 1,500 dishes of delicious Italian and/or Mexican Cuisine
Upgraded all three star foods to maximum
Served over 7,500 customers
Upgraded the Shish Kabob to maximum
Earn the secret Platinum Star Restaurant!
Served over 1,500 dishes straight from the oceans
Upgraded the Soup to maximum
Date the entire pool of people from Cook4Luv
Upgraded the Nachos to maximum
Upgraded the Baked Potato to maximum
Complete the Hungry Festivities
Upgraded the Fried Rice to maximum
Upgraded the Lobster to maximum
Upgraded the Sushi to maximum
Served over 1,500 drinks from your restaurant
Upgraded all two star foods to maximum
Upgraded the Pizza to maximum
Upgraded the Pasta to maximum
Upgraded the Bananas Foster to maximum
Upgraded your Wine Collection to maximum
Successfully funded all ClicknStart projects
Earn your Five Star Restaurant
Served over 5,000 customers
Complete all Iron Cook Challenges
Successfully stopped a robbery during a workday
Upgraded the Steak to maximum
Successfully serve a VIP guest
(Battle Kitchen) Unlock Three Special Guests
(Battle Kitchen) Unlock a Special Guest
(Battle Kitchen) Participate in a Weekly Challenge
Earn your Four Star Restaurant
Achieve a Perfect Day with a Four Star Restaurant or higher
Upgraded the Fish to maximum
Upgraded the Hamburger to maximum
Served over 1,500 dishes of delicious American Cuisine
Upgraded the Lasagna to maximum
Upgraded the Chicken Breast to maximum
Earn your Three Star Restaurant
Served over 2,500 customers
Earn your Two Star Restaurant
Served over 1,000 customers
Earn your One Star Restaurant
Achieve a Perfect Day
Served a Ryan Davis burger, named after the greatest man of our time