Here is the full list of all 14 Snow Moto Racing Freedom achievements.
Complete all other Achievements
Win a Championship event
Unlock every snowmobile
Win every Sprint Championship Gold Trophy
Win every Snocross Championship Gold Trophy
Win every Freedom League Championship Gold Trophy
Win gold medals in Time Trial mode on every Track
Win the gold medal in all Freestyle events
In a Sprint Championship race, pass all checkpoints in 1st place and win
Jump over 100m
Perform every stunt at least once in a race
Perform every air stunt at least once in a Freestyle Event
Perform every ground stunt at least once in a Freestyle Event
Perform 20 stunts during a Freestyle Event