Here is the full list of all 20 Cake Bash achievements worth 1,000 gamerscore. It takes around 5-6 hours to unlock all of the achievements on Xbox One.
Complete the playable tutorial
Complete 5 matches of Get Tasty
Collect all of the Gummy toppings in your Collection Menu
Collect all of the Fancy toppings in your Collection Menu
Collect all of the Creature toppings in your Collection Menu
Fully complete the Toppings section of your Collection Menu
Buy a random topping when you have 3 coins or fewer at the final Get Tasty shop...
Obtain 3 or more combo toppings in a single game of Get Tasty
Play 3 Bashes at the Beach
Play 3 Bashes at the Birthday
Score 3 golden fruits in a single match of Fruity Pie
Win a match of Fondue of Die without skewering anything gross
Achieve 5 perfect shots in a single match of Bakewell Ballet
Toast 3 perfect marshmallows in a single match of Campfire
Catch 3 masked pieces of cake in a single match of Caterpillar
Bash 8 or more wasps in a row in Wasp Attack
Stack 10 or more ice cream scoops in Neapolitan
Hit a hermit crab with a cocktail umbrella
Use only megabashes for the duration of a 4 player Bash, and win!
Completely fill your Collection Menu