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