Unlock Extreme Mode Difficulty Settings: Get the first place record in ALL 15 events.
Avoid Faults in Downhill Ski: Stay between two gray lines to avoid gate faults.
Speed Skating: Use an object like a small battery instead of your fingers at the start of any Speed Skating event where you need to tap A and B fast.
Ski Jumping: On either the normal or large hill on the Ski Jumping event use the Left analog stick to counter balance yourself if the circle on the arch strays to either left or right of the centre. You will stay level and get more distance by doing this.