The San Van Party Pack Add-on for Skate 3 has 9 achievements worth 250 gamerscore.
Complete the "Twin Spires" OTS Challenge
Complete the "Bump Riser" OTS Challenge
Complete the "Over the Rainbow" Photo Challenge
Complete "The Corkscrew" Photo Challenge
Complete the "Modern Manual" Photo Challenge
Complete the "Gallery Gap Line" Film Challenge
Complete "The Art of Rail" Film Challenge
Complete "The Quintessential Stair" Film Challenge
Complete the "Marraffa's Skatepark" OTL Challenge