Yakuza 3 Cheats, Codes & Guides

Substory Dabbler (Bronze): Complete 10 substories.
Substory Fan (Bronze): Complete 30 substories.
Substory Enthusiast (Bronze): Complete 50 substories.
Substory Addict (Bronze): Complete 80 substories.
Bounty Hunter (Bronze): Apprehend all hitmen.
Gourmet Aficionado (Bronze): Order the most expensive item(s) in all restaurants.
HEAT Action Pro (Bronze): Finish 50 battles with HEAT actions.
Tinkerer (Bronze): Make a mod weapon.
Blogging Debut (Bronze): Have your first Revelation.
Path of the Warrior (Bronze): Encounter all the masters.
Hat Trick (Bronze): Get a hat trick in darts.
Break Ace (Bronze): Get a break ace in Nine-Ball pool.
Karaoke King (Bronze): Sing all songs at karaoke.
Fowl Play (Bronze): Get a turkey while bowling.
Tag Hoarder (Bronze): Earn a combined total of 10,000 points in cee-lo, cho-han, koi-koi and oicho-kabu.
Chip Hoarder (Bronze): Earn a combined total of 10,000 points in poker, roulette and blackjack.
Pro Gamer (Bronze): Complete trophy conditions for the games in the arcade. Get 10 stuffed animals in UFO Catcher, and get a high score in the shooting game.
Skilled Hitter (Bronze): Hit 2 panels with one ball in the Hard game at the batting cage.
Power Driver (Bronze): Hit a 350 yard drive in Competition Mode in golf.
Big Tuna (Bronze): Catch a tuna.
Ultimate Challenger (Bronze): Play all rounds in Ultimate Skill mode after beating the game.
Marathon Runner (Bronze): Run 42,195km.
Key Collector (Silver): Open all the lockers in the top row in both Kamurocho and Downtown Ryuku.
Legendary Champion (Silver): Claim victory in all Coliseum tournaments.
Walking Bank (Silver): Accumulate 10,000,000 yen.
Substory Completionist (Gold): Complete all substories.
Minigame Master (Gold): Complete all minigames.
Testament to Strength (Gold): Beat the game on Extra Hard.

Additionally, there are 17 secret trophies:

Majima Defeated (Bronze): Defeat Majima in Chapter 1.
Rikiya Defeated (Bronze): Defeat Rikiya in Chapter 2.
Tamashiro Defeated (Bronze): Defeat Tamashiro in Chapter 3.
Hasebe Defeated (Bronze): Defeat Hasebe in Chapter 4.
Mysterious Foreigner Defeated (Bronze): Defeat the Mysterious Foreigner in Chapter 5 Bronze.
Kanda Defeated (Bronze): Defeat Kanda in Chapter 6.
Majima Defeated Again (Bronze): Defeat Majima again in Chapter 7.
Lau Ka Long Defeated (Bronze): Defeat Lau Ka Long in Chapter 8.
Fuma Defeated (Bronze): Defeat Fuma in Chapter 10.
Thank You! -YAKUZA 3 Team- (Bronze): Beat the game.
Careless Dragon (Bronze): Knock over 100 people.
People Watcher (Bronze): Initiate 10 battles using first-person mode.
Compulsive Vandal (Bronze): Break 100 weapons picked up in battle.
Volunteer (Bronze): Pick up 5 pieces of trash on Sunshine Beach.
Mine Defeated (Silver): Defeat Mine in Chapter 12.
Master Enviornmentalist (Silver): Pick up 30 pieces of trash on Sunshine Beach.
Platinum Trophy (Platinum): Earn all other trophies in the game.