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