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