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