Here is the full list of all 45 Yakuza 3 trophies - there are 36 bronze, 5 silver, 3 gold and 1 platinum.
Make a mod weapon.
Finish 50 battles with HEAT actions.
Get a hat trick in darts.
Knock over 100 people.
Break 100 weapons picked up in battles.
Complete 10 substories.
Defeat Tamashiro in Chapter 3.
Hit a 350 yard drive in Competition Mode in golf.
Remove 30 pieces of garbage from Sunshine beach.
Remove 5 pieces of garbage from Sunshine beach.
Initiate 10 battles by using first-person mode.
Defeat Rikiya in Chapter 2.
Defeat Majima in Chapter 1.
Earn all other trophies in the game.
Defeat Hasebe in Chapter 4.
Defeat man in black suit in Chapter 5.
Defeat Kanda in Chapter 6.
Defeat Majima again in Chapter 7.
Defeat Lau Ka Long in Chapter 8.
Defeat Fuma in Chapter 10.
Defeat Mine in Chapter 12.
Beat the game.
Complete 30 substories.
Complete 50 substories.
Complete 80 substories.
Complete all substories.
Apprehend all hitmen.
Open all the lockers in the top row in both Kamurocho and Downtown Ryukyu.
Order the most expensive item(s) in all restaurants.
Claim victory in all Coliseum tournaments.
Have your first Revelation.
Encounter all the masters.
Get a break ace in Nine-Ball pool.
Sing all songs at karaoke.
Get a turkey while bowling.
Earn a combined total of 10,000 points in cee-lo, cho-han, koi-koi and oicho-kabu.
Earn a combined total of 10,000 points in poker, roulette and blackjack.
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.
Hit 2 panels with one ball in the Hard game at the batting cage.
Catch a tuna.
Complete all minigames.
Play all rounds in Ultimate Skill mode after beating the game.
Beat the game on Extra Hard.
Run 42.195km.
Accumulate 10,000,000 yen.