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