Unlock Star Blade
You have to unlock Star Blade from Devil Within. Go to the first room in Stage 4-2, there is a breakable wall underneath the higher ledge. Transform to Devil Jin and press L1 + SQUARE to blast at the wall.
There will be some tiles appear after the wall is destroyed. Jump over the tiles and move on to the next room. There will be a spaceship from Star Blade in the middle of the room. Collect it and continue to beat Stage 4 to unlock Star Blade. (Unverified)
Unlockable: Start the Devil Within mini-game in Devil mode
Make sure you clear Devil Within at Medium difficulty with all the Evil Symbols collected. Go start a new Devil Within or Stage Select. Hold down L2, Select and R3 while selecting.
Unlockable: Final Stage 2
You have to play 200 arcade mode matches.
Unlockable: Devil Jin
To play as Devil Jin, you must complete Tekken: Devil Within mini-game.
Alternate method: complete story mode with everyone else and devil jin will be selectable.
Alternate method: You can also beat the game with every character and play more than about 200 games in Story Mode.
Unlock Jinpachi's Movie
To unlock Jinpachi's movie in Theater mode, you have to lose to him and get a game over using any character in Story Battle mode.
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Unlock Eddie Gordo
Buy all the extra costumes for Cristy Montero custom mode.
Seeko
Unlock Theater Mode
Beat Story Mode with any character. To play movies in Theater Mode You have to beat Story Mode with the character you want to unlock the movie for (that's self-explanatory). Beating Story mode requires you to play story mode with Christie, Eddy, Panda, and Kuma.
Unlockable: Characters
* Anna Williams: Beat Story Mode two times
* Baek: Beat Story Mode three times
* Bruce Irvin: Beat Story Mode 4 times
* Devil Jin: Complete Devil Within mini-game, or fight 200 matches.
* Ganryu: Beat Story, Battle or Time Attack mode 6 times
* Heihachi: Beat Story, Battle or Time Attack mode 8 times
* Kuma: Beat Story, Battle or Time Attack mode 5 times
* Ling (School Girl): Win 50 Versus matches, and press right-punch to select Ling.
* Mokujin: Beat Story, Battle or Time Attack mode 7 times
* Roger Jr.: Beat Story Mode with Kazuya
* Wang Jinrei: Beat story mode/time attack 5 times with different characters.