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