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