Unlock the following characters by performing the corresponding tasks:

CHARACTER - HOW TO UNLOCK
Bam Margera - Complete his pro challenge.
Beaver Mascot - Unlock high school.
Bob Burnquist - Complete his pro challenge.
Bum - Unlock the car factory level.
Daewon Song - Complete his pro challenge.
Dustin Dollin - Complete his pro challenge.
Filmer-  Unlock the high school level.
Jason Lee - Complete the final tony hawk goal.
Lyn-z Adams Hawkins - Complete her pro challenge.
Mike Valley - Complete his pro challenge.
Nyjah Huston - Complete his pro challenge.
Paul Rodriguez - Complete his pro challenge.
Photographer - Unlock the shops level.
Real Estate Agent - Unlock the downtown level.
Rodney Mullen - Complete his pro challenge.
Ryan Sheckler - Complete his pro challenge.
Security Guard - Unlock the school level.
Stevie Williams - Complete pro challenge.
Travis Barker - Complete pro challenge.
Zombie - Complete pro challenge.