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