Grinding Bucket List #4 is a great method, thanks to the previous solutions. I just wanna put the idea out there that there is a way to reduce the grind, if you aim to get this achievement for completing all Blizzard Mountain championships:
Create blueprints for each championship starting point, and always include the Whitestone Village Scramble
as one of the races. Every time you fast-travel to this event’s start location, there is a snowman staring right at you. Run him over then launch the event. Within this race, there are at least four snowmen you can plow through on your way to the finish line.
For the sake of expediency, all my blueprints include this race along with Snow Park Cross Country circuit, which is the smallest circuit track.
Doing this for all championships first will significantly reduce what remains for the grind.