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