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