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