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