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