God Hand

Unlock Hard mode:
Finish the game in normal mode once, to unlock the Hard difficulty level.

Unlock Fighting Ring challenges:
Clear Stage 1 to unlock Fighting Ring challenges.

Unlock Bonus Arena Challenges:

Unlock Arena Challenges 41-50:
Finish the entire game once.

Unlock Arena Challenge 51:
Finish Arena Challenges 41-50.

Jukebox CDs
Finish the following task to unlock the inidcated Jukebox CDs:
Unlock Jukebox A: Finish the game in normal or hard difficulty level once
Unlock Jukebox B: Go to the casino for jackpot pulls and get a redeem ticket
Unlock Jukebox C: Finish the game in hard mode.
Unlock Jukebox D: Finish the game in normal or hard difficulty level
with the "Kick Me" sign on without using any Godhand Power or GodHand Reels.

Unlock TV in the shop:
Finish Arena Challenge 51. It is used to watch trailers.

Unlock Chihuahua Race:
Finish Stage 2, then speak with the male NPC in the shop.

Unlock bonus costumes:
Finish the game once to unlock the following character's alternate costumes:
Olivia's Bunny Girl
Carnival
Karate and
Devil Hand

Start from 2nd round, there'e an extra NPC in the shop, speak with him
to change the outfit.