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