Here is the full list of all 14 Snow Moto Racing Freedom achievements.
Win a Championship event
Jump over 100m
In a Sprint Championship race, pass all checkpoints in 1st place and win
Complete all other Achievements
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
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