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