Dark Summit

Go backwards:
Hit Z while jumping.

Outfit 2: Reach minimum 50,000 points.
Outfit 3: Reach minimum 100,000 points.
Outfit 4: Reach minimum 150,000 points.
Outfit 5: Reach minimum 200,000 points.
Outfit 6: Reach minimum 250,000 points.
Outfit 7: Reach minimum 375,000 points.
Outfit 8: Reach minimum 500,000 points.
Outfit 9: Reach minimum 625,000 points.
Outfit 10: Reach minimum 750,000 points.
Outfit 11: Reach minimum 875,000 points.
Outfit 12: Reach minimum 1,000,000 points.
Outfit 13: Reach minimum 1,250,000 points.
Outfit 14: Reach minimum 1,500,000 points.
Outfit 15: Reach minimum 1,750,000 points.
Outfit 16: Reach minimum 2,000,000 points.
Dynamic 3000 snowboard: Reach minimum 1,000,000 points.
Prototype MG snowboard: Reach minimum 2,000,000 points.
Slick 250 snowboard: Reach minimum 250,000 points.

Unlock Helidrop level
Finish the Ski Patrol Chief challenge

Unlock Moon Gate level
Finish the Do Not Enter challenge

Get points easy:
While doing any trick, pause the game.
After the game is continued, you will get the points from the trick,
even though it was not completed.