Here is the full list of all 90 Papa's Freezeria Deluxe achievements. It takes around 25-30 hours to unlock all of the achievements on Windows.
Reach Autumn
Reach Winter
Reach Spring
Reach Summer
Unlock all Starlight Jubilee toppings
Unlock all Portallini Feast toppings
Unlock all Maple Mornings toppings
Unlock all Halloween toppings
Unlock all Thanksgiving toppings
Unlock all Christmas toppings
Unlock all New Year toppings
Unlock all Valentine's Day toppings
Unlock all St. Paddy's Day toppings
Unlock all Easter toppings
Unlock all Big Top Carnival toppings
Unlock all Volcano Gala toppings
Serve the first customer last
Have Quinn's order ready when she arrives and serve immediately
Have Kahuna's order ready when he arrives and serve immediately
Earn 5 Bronze Customer Awards
Earn 15 Bronze Customer Awards
Earn 10 Silver Customer Awards
Earn 15 Gold Customer Awards
Get a 100% Waiting Score on 20 orders
Get a 100% Build Score on 20 orders
Get a 100% Mix Score on 20 orders
Get a 100% Topping Score on 20 orders
Get a Perfect Score on 30 orders
Get 5 Blue Ribbons from Jojo the Food Critic
Receive your wages on four Pay Days
Don't spend any money in the Shop for 7 days
Buy any 50 items from the Shop
Buy any 8 Posters from the Shop
Buy any 8 Furniture items from the Shop
Buy any 8 Clothing items from the Shop
Buy any 4 Flooring or Wallpaper from the Shop
Buy all of the Upgrades in the Shop
Change your worker's shirt, pants, hat, jacket, and shoes.
Serve everyone in the Romano Family Quartet
Serve all the band members of Scarlett and the Shakers
Serve all of the customers!
Serve all of the Costumed Closers during Halloween
Earn a Prize in each of Foodini's Mini-Games
Earn 5 Prizes or more in each of Foodini's Mini-Games
Win a Rare Bonus Prize in a Mini-Game by earning a Star Medal
Earn 5 Special Recipes from customers
Earn 15 Special Recipes from customers
Earn 40 Special Recipes from customers
Earn 3 Special Stars when serving Today's Special
Master a Special Recipe by earning 5 Special Stars
Master 10 Special Recipes by earning 5 Stars on each
Master 20 Special Recipes by earning 5 Stars on each
Unlock all of the Standard Mixables
Unlock all of the Standard Mix Syrups
Unlock all of the Standard Whipped Creams
Unlock all of the Standard Shakers
Unlock all of the Standard Sauce Toppings
Unlock all of the Standard Placeable Toppings
Serve a Chocolate Creameo Special to Captain Cori
Serve a Tropical Treat Special to Tony
Serve a Red Velvet Cake Special to Kingsley
Serve a Vanilla Swizzle Special to Liezel
Serve a Sugarplum Streusel Special to Scooter
Serve a Cinnamon Crunch Special to Marty
Serve a Wildberry Moon Special to Willow
Serve a Caramel Macchiato Special to Akari
Serve a Purple Pom Special to Pally
Serve a Truffle Bomb Special to Treble
Serve a Mighty Mint Special to Mayor Mallow
Serve an Orange Roll Delight Special to Rollie
Use Cotton Candy Syrup in Mandi's sundae
Add Cloudberries to Nevada's sundae
Add Shaved Mints to Edna's sundae
Use Yum n' Ms in Sasha's sundae
Add Pawpaw Topping to Papa Louie's sundae
Serve 100 customers while wearing clothing that matches the season
Serve 20 customers during Christmas wearing a Christmas Hat and Fur Parka
Serve Roy while wearing a Pizzeria Polo and Pizzeria Cap
Serve Jojo while wearing a Turtleneck and Beret
Wear a shirt, belt, jacket, pants, hat, and shoes to match the current holiday
Dress your Chef and Driver in the exact same outfit but with different colors
Have 10 different kinds of bubble gum in the lobby at once
Use lots of musical furniture so 3 or more customers are dancing in the lobby
Grab 250 coins while playing Papa's Raceway
Send 10 Customer Coupons to your customers
Leave four sundaes on blenders at the end of the day
Serve 20 delivery orders to customers
Serve 30 orders to customers in the Dining Room
Serve any 10 sundaes from the Food Truck
Lure 3 regular customers to the Food Truck by preparing their normal order