The following codes are all case-sensitive

Unlock Mindy: help1nghand

Unlock Jason Ellis: sirius-DJ

Unlock Mat Hoffman: the_condor

Unlock All Story Mode Levels: JARMIE

Perfect Grind: grindXpert
(The bar will still fill but you will not fall when in the red)

Perfect Manual: 2wheels!
(The bar will still fill but you will not fall when in the red)

Perfect skitch: h!tchar!de
(The bar will still fill but you will not fall when in the red)

Unlock Billy Joe:
In Normal difficulty setting successfully complete Classic mode.

Bails N' Burns 1 movie:
In Normal difficulty setting successfully complete Classic mode. Unlock Boone:
In Normal difficulty setting Successfully complete Classic mode.

Unlock Mat Hoffman:
In Hard/Sick difficulty setting successfully complete Clasisc mode. Unlock Dave:
In Hard/Sick difficulty setting successfully complete Clasisc mode.

Unlock Murphy:
In Hard/Sick difficulty setting successfully complete Story mode. Unlock Mega:
In Hard/Sick difficulty setting successfully complete Story mode.

Unlock Jimbo:
In Hard/Sick difficulty setting successfully complete Story mode.

Unlock Iggy:
In Normal difficulty setting successfully complete Story mode. Unlock Jason Ellis:
In Normal difficulty setting successfully complete Story mode. Unlock Little John:
In Normal difficulty setting successfully complete Story mode. Unlock Mindy:
In Easy difficulty setting successfully complete Story mode. Unlock Robot Tony:
In Easy difficulty setting successfully complete Story mode.

American Wasteland Final movie:
In Normal difficulty setting successfully complete Story mode. Unlock Barber:
Complete all Skate Ranch missions. Unlock Downtown Guy:
Complete all Skate Ranch missions.

Unlock French Guy:
Complete all Skate Ranch missions.

Unlock Carnival Guy:
Complete all Skate Ranch missions. Unlock Downtown Guy:
In Classic mode get a 100% completion. Unlock Graffiti Guy:
In Classic mode get a 100% completion. Unlock Hardhat Guy:
In Classic mode get a 100% completion. Unlock Master Zen:
In Classic mode get a 100% completion. Dev-Team Skates Movie:
In Classic mode get a 100% completion.

Unlock Camera Guy:
In Story mode get a 100% completion. Unlock Chloe:
In Story mode get a 100% completion.

Unlock Welder:
In Story mode get a 100% completion.

Unlock Baller:
In Story mode get a 100% completion. Bails N' Burns 2 movie:
In Story mode get a 100% completion.