If you want bonuses and want to get more of Yakuza 4. You can get these bonuses and more materials for the game.
|Premium Adventure||Clear the game on any difficulty|
|Premium New Game||Clear the game on any difficulty|
|Reminiscence (Kaisou)||Clear the game on any difficulty|
|Ultimate Competition (Kyuukyoku Tougi)||Clear the game on any difficulty|
|1000000 yen bonus||Clear Easy mode|
|2000000 yen bonus||Clear Normal mode|
|3000000 yen bonus||Clear Hard mode|
|EX-Hard Mode||Clear Hard mode|
|5000000 yen bonus||Clear EX-Hard mode|
|Asagao Special Torso Wrap||Have an existing Yakuza 3 system file|
|Bell of Gion||Have an existing Ryuu ga Gotoku Kenzan! save file|
|Underground SP Championship||Clear the game on any difficulty. Enter Naomi no Yakata located on Tenkaichi Street. Talk to Utsunomiya Bob A.|
For a complete list of Trophies you can head over here.