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