Here is the full list of all 17 Frozen Free Fall: Snowball Fight achievements worth 1,000 gamerscore.
Obtain a total of 500 stars
Complete 50 Snowball Fights
Beat your opponent with 10 different characters
Finish first 100 Winter levels
Combine 15 Double Iceberg gems
Combine 20 Windchill and Glacier gems
Obtain a total of 100 stars
Combine 30 Windchill gems
Dodge 3 snowballs in a round
Obtain 150,000 Points on one level
Throw 3 super snowballs in a round
Throw 10 snowballs in a round
Combine 25 Windchill and Iceberg gems
Obtain a total of 1 Million points
Combine 5 Double Glacier gems
Obtain 50,000 Points on one level
Combine 10 Iceberg and Glacier gems