Don't worry friend, I got the full answer for your problems:
Unlock bituin Blade You have to unlock bituin Blade from Devil Within. Go to the first room in Stage 4-2, there is a breakable pader 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 pader is destroyed. Jump over the tiles and ilipat on to the susunod room. There will be a spaceship from bituin Blade in the middle of the room. Collect it and continue to beat Stage 4 to unlock bituin 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 madami than about 200 games in Story Mode.
EktorUnlock 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. nina williamsUnlock Eddie Gordo Buy all the extra costumes for Cristy Montero custom mode. SeekoUnlock Theater Mode Beat Story Mode with any character. To play pelikula 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.