Skate 3 , unlock challenges

[MasterObtar]

i need to know how to unlock all the challenges , i have done all that i can do , so how do i unlock the other ones .
so far i have done:

Death race : 9
Film : 12
getting started : 6
Hall of meat : 20
Own the lot : 11
Own the spot : 12
Photo : 18
Pros : 19
Team promos : 20

Can anyone help ? :shrug: :shrug: :shrug:

 

[I Am Pein]

land a triple hardflip switch darkside 540 tailslide nollie impossible backflip manual to unlock all challenges and a cookie hat

 

[MasterObtar]

land a triple hardflip switch darkside 540 tailslide nollie impossible backflip manual to unlock all challenges and a cookie hat

R u serious :shrug: