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