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