Unlock Baller:
Get a 100% completion in Story mode.

Unlock Barber:
Complete all Skate Ranch missions.

Unlock Billy Joe:
Successfully complete Classic mode under the normal difficulty setting.

Unlock Boone:
Successfully complete Classic mode under the normal difficulty setting.

Unlock Camera Guy:
Get a 100% completion in Story mode.

Unlock Carnival Guy:
Complete all Skate Ranch missions.

Unlock Chloe:
Get a 100% completion in Story mode.

Unlock Dave:
Successfully complete Clasisc mode under the hard/sick difficulty setting.

Unlock Downtown Guy:
Complete all Skate Ranch missions.

Unlock Downtown Guy:
Get a 100% completion in Classic mode.

Unlock French Guy:
Complete all Skate Ranch missions.

Unlock Graffiti Guy:
Get a 100% completion in Classic mode.

Unlock Hardhat Guy:
Get a 100% completion in Classic mode.

Unlock Iggy:
Successfully complete Story mode under the normal difficulty setting.

Unlock Jason Ellis:
Successfully complete Story mode under the normal difficulty setting.

Unlock Jimbo:
Successfully complete Story mode under the hard/sick difficulty setting.

Unlock Little John:
Successfully complete Story mode under the normal difficulty setting.

Unlock Master Zen:
Get a 100% completion in Classic mode.

Unlock Mat Hoffman:
Successfully complete Clasisc mode under the hard/sick difficulty setting.

Unlock Mega:
Successfully complete Story mode under the hard/sick difficulty setting.

Unlock Mindy:
Successfully complete Story mode under the easy difficulty setting.

Unlock Murphy:
Successfully complete Story mode under the hard/sick difficulty setting.

Unlock Robot Tony:
Successfully complete Story mode under the easy difficulty setting.

Unlock Welder:
Get a 100% completion in Story mode.

American Wasteland Final movie:
Successfully complete Story mode under the normal difficulty setting.

Bails N' Burns 1 movie:
Successfully complete Classic mode under the normal difficulty setting.

Bails N' Burns 2 movie:
Get a 100% completion in Story mode.

Dev-Team Skates movie:
Get a 100% completion in Classic mode.