Here is the full list of all 56 Like a Dragon: Ishin! achievements. It takes around 120-150 hours to unlock all of the achievements on Windows.
Collected all achievements.
Completed every Ultimate Challenge.
Completed all tasks in the Diligence Records.
Enhanced equipment 100 times.
Completed all Bonds.
Brought the Completion List to 100%.
Broke Ryoma's stats beyond their limits.
Completed the final chapter.
Completed the game on Legend difficulty.
Completed all Substories.
Completed Chapter 12.
Paid off Haruka's debt in full.
Cleared the Sanada Stronghold.
Attained all Revelations.
Won 10 arena battles.
Cleared the Bandits' Mine.
Defeated 100 enemies with Special Moves outside Ultimate Challenges.
Gathered 100 troopers for the Third Division.
Performed every song at Utamaruya.
Completed Chapter 10.
Cleared the Bandits' Cave.
Reached Level 50.
Reached max Social Rank in one of the locales.
Placed bets on 5 chicken races.
Completed Chapter 8.
Cooked 7 different dishes.
Brought the Completion List to 50%.
Cleared each of the courtesan minigames.
Played every minigame.
Ordered at least one item at every restaurant.
Helped the Tachibanagumi bring the Tengu to justice.
Performed every dance at Nichibuza.
Changed the interior design of your second home.
Earned at least 300,000 Virtue in total.
Completed Chapter 6.
Entered a Battle Dungeon 3 times.
Made at least 10 ryo in sales at the Udon Shop.
Completed 50 tasks in the Diligence Records.
Tried your hand at each type of gambling.
Completed 40 Substories.
Watched a Slice of Life event at your second home.
Earned at least 100,000 Virtue in total.
Fulfilled 10 trade orders at your second home.
Grew 10 different kinds of plants in the garden.
Completed 20 tasks in the Diligence Records.
Earned at least 50,000 Virtue in total.
Completed Chapter 4.
Trained with each master of combat.
Completed 10 Substories.
Earned at least 10,000 Virtue in total.
Completed Chapter 2.
Completed 5 tasks in the Diligence Records.
Completed your first Bond.
Caught a total of 10 fish.
Unlocked 10 abilities with Soul Orbs.
Set foot in Tosa.