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