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