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