TEKKEN 5 UNLOCKABLES
Theater Mode
Theater Mode is unlocked up after you complete story mode once with any character. At that time, you are able to listen to the stage soundtracks, view the movies of the character used to complete story mode, and the attract movies (Arcade Intro, PlayStation2 Intro, and E3/TGS trailers). As you complete story mode with each character, the movies will become available in Theater Mode. Getting all movies requires you the complete story mode with both Kuma and Panda, as well as Christie and Eddy (although Eddy's ending is identical).
Stage Select for Devil Within
Beat Devil Within once to unlock the stage select feature.
Anna Williams
Complete Roger Jr.'s story mode.
Baek Doo San
Complete Marduk's story in story mode.
Bruce Irvin
Complete Lei's story in story mode.
Devil Jin
You can unlock Devil Jin by either completing the "Devil Within" side game or playing a number of games in arcade mode, vs mode or story mode. About 200 games in arcade mode seems to unlock him after you have unlocked all the other characters.
Eddy Gordo
Eddy is an extra outfit you buy for Christie for 500,000G.
Ganryu
Complete Kuma's story in story mode.
Heihachi
Complete Mokujin's story in story mode.
Kuma
Complete Feng's story in story mode.