Here is the full list of all 55 Yakuza Kiwami achievements. It takes around 80-100 hours to unlock all of the achievements on Windows.
Obtain all other achievements.
Completed the game in Legend Mode.
Completed all of the Climax Battles.
Completed 100% of the Completion List.
Enjoyed mahjong with a hostess.
Played all minigames.
Obtained EX Rank on Haruka's Requests.
Assaulted by Majima from above.
Walked 1km during Premium Adventure while holding Haruka's hand.
Completed the final chapter.
Completed all substories.
Defeated Amon.
Slugger Majima forced his way into a fight.
Upgraded all Majima Everywhere abilities.
Completed "Wife of a Yakuza."
Completed "Man On a Ledge."
Completed chapter 12.
Completed chapter 11.
The Mad Dog of Shimano forced his way into a fight.
Obtained all Soul, Technique, and Body abilities.
Thug Majima forced his way into a fight.
Completed "The Fake Mizuki's Truth."
Completed all training for Komaki Style.
Won all tournaments in the underground coliseum.
Completed chapter 10.
Completed chapter 9.
Completed chapter 8.
Met the mysterious lady, Goromi.
Reached Rank B in Majima Everywhere.
Completed chapter 7.
Completed "Bet On A Champ."
Completed "A Doctor's Duty."
Completed chapter 6.
Spent a steamy moment with Yui.
Spent a steamy moment with Rina.
Successfully asked a hostess out on a date.
Won against all rivals in MesuKing.
Completed "My Baby's a Showgirl."
Completed 50% of the Completion List.
Completed chapter 5.
Completed 30 substories.
Assaulted by Majima from a manhole.
Breaker Majima forced his way into a fight.
Met Zombie Majima.
Won all Pocket Circuit races.
Completed 10 substories.
Completed chapter 4.
Completed "The Price of an F-Cup."
Met Officer Majima.
Got chased by Majima.
Completed chapter 3.
Obtained at least 10 Soul, Technique, and Body abilities.
Completed chapter 2.
Completed chapter 1.
Collected the money owed.