Tony Hawk's Underground 2
  
PS2




  Ben Franklin:

Beat Boston in story mode.

Call Of Duty guy: 

Beat story mode on sick difficulty.
Graffiti Tagger:

Beat Berlin  in story mode.

Jesse James:

Beat classic mode on sick difficulty.
Jester:

Beat New Orleans in story
mode.
Matador:

Beat Barcelona in story
mode.

Natas Kaupas:

Beat classic mode on sick difficulty.

Nigel:

Beat story mode on sick difficulty.

Paulie:

Go to Options, then Cheats and enter 4wheeler. 

Peds Group A:

Beat story mode on easy difficulty.

Peds Group B:

Beat story mode on normal difficulty.

Peds Group C:

Beat story mode on sick difficulty.
Peds Group D:

Beat classic mode on normal difficulty.

Peds Group E:

Beat classic mode on sick difficulty.

Peds Group F:

Beat 100% of  story mode.

Peds Group G:

Beat 100% of  classic mode.

Peds Group H:

Clear all the gaps on all fifteen levels.

Phil Margera:

Beat story mode on easy difficulty, or go to Options, then cheats and enter aprilsman.

Ryan Sheckler:

Beat the Skatopia level in story mode.

Shrek:

Beat story mode on easy difficulty.

Shrimp Vendor:

Beat the Australia level in story
mode.
Steve-O:

Beat classic mode on normal difficulty.

The Hand:

Beat story mode on normal difficulty.

Original 
Tony Hawk:

Beat classic mode on normal difficulty setting.

Pro Skater Level:

Beat story mode.

Triangle Level:

Beat classic mode.
Cheats Movie:

Clear all the gaps in every fifteen level.

Neversoft Skates Movie:

Beat 100% of classic mode.

Pro Bails 1 Movie:

Beat classic mode.

Pro Bails 2 Movie:

Beat 100% of  story mode.

World Destruction Tour Movie:

Beat story mode.
Natas Kaupas: 

Enter "oldskool" at the Cheat menu.

Paulie:

  Enter "4-wheeler" at the Cheat menu.


  
  Unlock all Levels:

  Enter "d3struct" at the Cheat Menu.
  


  Unlock all Movies:

  Enter "boxoffice" at the Cheat menu.
  


   Nigel Beaverhousen:

  Enter "sellout" at the Cheat menu.
  


    Phil Margera:

  Enter "aprilsman" at the Cheat menu.
  


    Get Alien, Sherk, etc:

  Enter "costars" at the Cheat menu.
  


    Infinite Special:

  Enter "likepaulie" at the Cheat menu.
  


    Infinite Rail and Lip Balance:

  Enter "straightedge" at the Cheat menu.
  

  
Easy rails: 

Go to Options then Cheats and enter straightedge.






Thanks to Revolution readers Cyrus,  Joe-bob briggs, QA Master, Satanic Mechanics, fatima latoya jackson, Rafael Perez, bootleg, javier diaz gonzalez garcia, and Shoshana Serna!