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