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