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