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