There isn't really any need for a complicated page, so here's a nice table of the codes so far.

Name Code
Code FAQ Contains tons of codes not on this page.
Game 100% Complete (Note 1) 20159928 24060001
 
No Random Encounters (Note 2) 201D0CB0 2402FFFF
 
Super AP Gain 2020547C 2414270F
 
Learn One Skill Per Kill 201D1F8C 2414270F
 
Al Bhed Fully Translated 20373EE4 FFFFFFFF
 
Sphere Break: Have All Coins 2036D7E4 FFFFFF00
2036D7E8 FFFFFFFF
0036D7EC 000000FF
2036D790 02030501
2036D794 06020503
2036D798 08020305
2036D79C 03040107
2036D7A0 07030904
2036D7A4 06010502
2036D7A8 07090308
2036D7AC 04020501
2036D7B0 09040703
2036D7B4 02060103
2036D7B8 09030105
2036D7BC 02030307
2036D7C0 05060703
2036D7C4 09030204
2036D7C8 09090909
2036D7CC 09090909
 
Sphere Break: Infinite/Max Coins 4036D750 00100001
63636363 00000000
 
Sphere Break: Coins Have High Sale Value 4036D6D0 00200001
7FFF7FFF 00000000
 
Sphere Break: Entry Coin Value Modifiers (Note 7) 0036CA26 000000??
0036CA27 000000??
0036CA28 000000??
0036CA29 000000??
 
All Enemies Oversoul (Note 3) 201E1C40 2404270F
 
Publicity Mini-game: Max Points (Argent) 2036D4B8 000003ED
Publicity Mini-game: Max Points (Open Air) 2036D4B4 000003ED
 
Enabler for the all items/accessories/skills codes 20237CF4 0803CC00
200F3000 FFB00000
200F31F0 DFBF0010
200F31F4 DFB00000
200F31F8 03E00008
200F31FC 27BD0020
Have All Blue Bullets and Skills Mastered (All Jobs)
You must enter the Enable code above!
200F3014 0C073BD6
200F301C 0C073BF2
Have All Items
You must enter the Enable code above!
200F300C 0C073C10
Have All Accessories
You must enter the Enable code above!
200F3004 0C073C40
 
Bikanel Dig: Have 255 of Each Part In the Catalogue
(Note 4)
2036D494 00FF00FF
2036D498 00FF00FF
2036D49C 00FF00FF
2036D4A0 00FF00FF
1036D4A4 000000FF
 
All Key Items 20374820 FFFFFFFF
20374824 FFFFFFFF
20374828 FFFFFFFF
 
Shinra's Bestiary: All Fiends (Long version) 20374720 FFFFFFFF
20374724 FFFFFFFF
20374728 FFFFFFFF
2037472C FFFFFFFF
20374730 FFFFFFFF
20374734 FFFFFFFF
20374738 FFFFFFFF
2037473C FFFFFFFF
20374740 FFFFFFFF
20374744 FFFFFFFF
Shinra's Bestiary: All Fiends (Short Version)
(Note 5)
40374720 000A0001
FFFFFFFF 00000000
 
Shinra's Bestiary: All Fiends Oversouled (Long version) 203747A0 FFFFFFFF
203747A4 FFFFFFFF
203747A8 FFFFFFFF
203747AC FFFFFFFF
203747B0 FFFFFFFF
203747B4 FFFFFFFF
203747B8 FFFFFFFF
203747BC FFFFFFFF
203747C0 FFFFFFFF
203747C4 FFFFFFFF
Shinra's Bestiary: All Fiends Oversouled(Short Version)
(Note 5)
403747A0 000A0001
FFFFFFFF 00000000
 
Shinra's Bestiary: Complete 201E1A90 2403FFFF
201E1A94 A4430000
201E1A98 00831807
201E1A9C 30630001
201E1AA0 03E00008
201E1AA4 0060102D
 
Shinra's Bestiary: Kill One Enemy And Many Are Added 201E1AE0 2402FFFF
 
All Garment Grids (Note 6) 20373F14 FFFFFFFF
20373F18 FFFFFFFF
 
Yuna: All Attacks Do 9,999 Damage 003748FD 00000040
Rikku: All Attacks Do 9,999 Damage 0037496D 00000040
Paine: All Attacks Do 9,999 Damage 003749DD 00000040
 
O'aka's Debt Is 1 Gil 2036D864 3F800000
 
Can Always Change to Special Dress Sphere 202F8ECC 00431025
 

NOTE 1: There are several things you still must do to get the Good and Perfect endings. I will try to find a list. This code does not save! You must have it active in order for it to work. Don't ask me for a save-able version. The game sets aside a block of 16kb in memory for "completion flags" and all of them require a different value. If I can find a save with a legitimate 100% it may become possible.
NOTE 2: This code has the opposite effect in the Bevelle dungeon (an encounter every step).
NOTE 3: I think this works only for "Oversoul Subjects", but it might work on everything. In the Bestiary, even "Normal Subjects" have space for oversoul data. Although it probably doesn't mean anything.
NOTE 4: You must go to Djose Temple to access the parts catalog.
NOTE 5: Due to a bug in some Codebreaker versions, the short versions of the bestiary codes may not work for you. You can either use the long versions, or the 6-line Bestiary: Complete code below them.

Entering both codes (or the Complete code) completes the bestiary and oversoul data, getting you the "The End" Garment Grid. With the Complete code, entering just the first line will complete the bestiary, get you the Garment Grid and when you reload your bestiary will be back to its former, incomplete state.

NOTE 6: You get four extras with this code that were most likely test grids. Their names are, "Circle," "Triangle," "Infinite," and, "Max."
NOTE 7: Each line of the code changes a different entry coin in the sphere break game. This is useful for getting a leg up in the tournament. Change the ?? to 00-09 as you see fit. If you get a set of coins for tournament play that includes one with an echo trait, setting these to 2, 4, 6 and 8 will make you virtually invincible.