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