CheatCodes.com has all the official Shadow Hearts PS2 cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Thursday May 23, 2013 for Shadow Hearts are shown below.
Use the following trick to defeat Seraphic Radiance or any Boss. Let Yuri use Monkey's Paw on himself. The second character should use Gold Hourglass to negate the ring abnormality of the Monkey's Paw effect. The third character should use Moon Swallow so all hits will become critical. On Yuri's turn, morph into Amon or Seraphic Radiance, or any level 3 fusion monster. Use Seventh Key and make sure you hit all Judgment Ring bars, not necessarily on the red (critical) portion. The first hit may even reach 999 if you are lucky.
When you beat the game and after the credits, save. Load that save and you will have all the fusions from before to start with!
Before you proceed to the last mission (Neameto Float), Halley will go see her mother Koudelka. Do not follow him yet. Go to your valuables section and read the Oath Grail's description (item from Joshua). Go to a dungeon and let the malice fill up to red. Instead of Fox Face, the masks will go after you on random battles. Defeat all four of them. Do not clear up the malice and they will hunt you again. This time, they will have only 1 HP, and you need to defeat them in this order: Grail, Gold, Sword, and Staff. This is a trial-and-error process, so you may need to save and load depending on the order. By the time Alice is supposed to die at the hands of Atman, Yuri will barge in to help her and you will be able to win the battle.
When you find yourself running out of energy units, allow yourself to die. The moment you are brought back to life, you will get an energy unit for free. For example, if you let yourself die five times in a row you will get five energy units for free. Do this trick each time you begin a new chapter.
To get your fusion demons to learn a unusable command, let Yuri go Berserk when he fuses with a fusion demon who hasn't learned their magic attack yet.
When you beat the game let the credits roll and watch the movie. At the end of the movie save your game and play it again except you get all of the fusion demons you got from the first time you beat it.
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