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