Here is the full list of all 21 Delicious - there are Emily's Christmas Carol achievements.
Collect all other achievements
Walk 1000 miles
Find all mice
Find the two turtle doves in the game and reunite them
Buy all shop items
Use every product in every restaurant at least once
Unlock all product upgrades
Buy all the secret gifts and use them
Finish all events and challenges
Finish every level with 3 stars
Finish Santa’s Home
Serve 500 chocolate related products
Finish Mary's Toy Shop
Pick up all the nuts the squirrel leaves behind
Finish The Reindeer Farm
Serve 400 customers quickly
Finish the Miracle Express
Make 250 combos
Finish George's Train Station
Finish Emily's Snow Garden
Restock items 350 times