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