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