Like a Dragon Gaiden: The Man Who Erased His Name

Hey all,

You can unlock this achievement in chapter 2.
You need to hit some milestones first:

1) Hit Gold Rank (so the activities with Akame are unlocked)
2) Hit lv 13 in the Akame Network (lv 2 Drink Link), it will allow you to ask Akame to sing with you at the karaoke.
Lv 3 you can play darts with her, lv 4 (which is another achievement) you can challenge her on pocket race.
3) Go to the Karaoke Bar (Bar New Momoko), pay 1000 yen, invite Akame to sing with you. Then select the last song (Like a Butterfly) and choose passionate backup. Finish the song and the achievement is yours!

I was Network lv 21, but silver and I couldn't do any activities with her (you need to see some cutscene to unlock each activity). As soon as I hit gold, I could do all the cutscenes in a row and I could invite her out.

Happy hunting!

To sing karaoke with Akame in Like A Dragon Gaiden, you first need to complete all the silver fights in the Coliseum and level up the Akame Network to 13. Next, head to the Karaoke bar, pay to sing, choose to sing with Akame, and select a song with a back up singer.