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