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