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