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