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