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