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