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