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