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