Hello,
First time posting on nextgenupdate, I've been using the forum a lot and now I think I have the chance contribute with something, I hope those saves work:
They are from the disc US version, I've applied some cheats from Bruteforce Save Data 4.7, and they're in blank state.
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* I am brazillian so I'm sorry for my english.
First one:
BLUS30643L02 takes you to the last part of chapter one, proceed with the story to earn:
Part 1 Cleared
Clear Part 1 of the story.
You can also open 5 lockers to earn:
Way of the Key Master
Open five coin lockers.
And play all games on casino and Sega Club to earn:
Novice Gambler
Play all non-casino gambling games.
Casino Rookie
Play all casino gambling games.
Welcome to SEGA
Play all minigames at Club SEGA.
You can also earn this one:
History Buff
View all Reminiscences from YAKUZA to YAKUZA 3.
This one:
BLUS30643L04 takes you to the last part of chapter two, meet Majima and defeat him to earn:
Part 2 Cleared
Clear Part 2 of the story.
-> I forgot to save at the end of chapters 3 and 4, but if you follow from this save you probably will achieve both in 3 or 4 hours.
Also you will be able to get thist trophy, after doing 3 substories with Tanimura (quite easy):
20 Substories
Complete or finish twenty substories.
And finally:
BLUS30643L07 takes you strainght to the finale.
All characters on this save are level 19, one more fight with each will grant you this trophy:
Heir to the Powerful
Max out all characters to level 20.
Also after walking a little you will earn this one:
Kamurocho Iron Man
Traverse 100 kilometers or more.
This save is on Extra Hard Dificulty, all character have the Golden Gun, you probably will earn theses trophys beating the game:
Thank You (gold)
Clear the Finale.
Heir to the Legend (gold)
Clear Extra Hard Mode.
Indomitable (silver)
Clear Normal Mode without reverting to Easy Mode.
And that's it, I hope it helps! With those 3 saves I think Platinum is achievable, but you will have to play a little. It's a great game tottaly worth it!