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