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