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.
(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
Upgraded all three star foods to maximum
Upgraded the Bananas Foster to maximum
Upgraded the Fried Rice to maximum
Upgraded the Lasagna to maximum
Upgraded the Nachos to maximum
Upgraded the Pasta to maximum
Upgraded the Shish Kabob to maximum
Upgraded the Pizza to maximum
Upgraded the Soup to maximum
Served over 15,000 customers
Date the entire pool of people from Cook4Luv
(Battle Kitchen) Unlock Six Special Guests
(Battle Kitchen) Unlock Three Special Guests
Served over 1,500 dishes of Japanese, Chinese and Asian Cuisine
Served over 10,000 customers
Served over 1,500 dishes of delicious Breakfast foods
Served over 1,500 dishes of delicious Italian and/or Mexican Cuisine
Earn the secret Platinum Star Restaurant!
Complete the Hungry Festivities
Served over 7,500 customers
Served over 1,500 drinks from your restaurant
Served over 1,500 dishes straight from the oceans
Upgraded the Sushi to maximum
Successfully funded all ClicknStart projects
Upgraded the Lobster to maximum
Upgraded the Steak to maximum
Earn your Five Star Restaurant
Complete all Iron Cook Challenges
Upgraded your Wine Collection to maximum
Served over 1,500 dishes of delicious American Cuisine
Successfully serve a VIP guest
Served over 5,000 customers
(Battle Kitchen) Unlock a Special Guest
Achieve a Perfect Day with a Four Star Restaurant or higher
Earn your Four Star Restaurant
Upgraded all two star foods to maximum
Upgraded the Hamburger to maximum
(Battle Kitchen) Participate in a Weekly Challenge
Earn your Three Star Restaurant
Upgraded the Baked Potato to maximum
Upgraded the Fish to maximum
Upgraded the Chicken Breast to maximum
Served over 2,500 customers
Successfully stopped a robbery during a workday
Earn your Two Star Restaurant
Served a Ryan Davis burger, named after the greatest man of our time
Earn your One Star Restaurant
Served over 1,000 customers
Achieve a Perfect Day