Genshin Impact: Lynette Hangout Event Guide

A Decision - (When Lynette uses the Fateometer)

Choose the option: I think you should head back to the drinks reception...

That's All, Folks - (When the show is finished and Ginna wants to talk to Lynette)

Choose the option: [Performance] What's she talking about? Never heard of it.
Then, get a card above 6.

That's All, Folks - (When the show is finished and Ginna wants to talk to Lynette)

Choose the option: (Wait and see how things play out.)

A Decision - (When Lynette uses the Fateometer)

Choose the option: I think you should help Bonnie...

Pierre's Lost Base - (When you swim underwater after Lynette suggested it)

If after swimming around, and this place isn't navigated, try to relog the game.
If it still hasn't been marked, change your in-game time to 15:30 (This is the current time when I find the area)

Falling Into Layers of Fog - (When you catch up to Bernand)

Make sure to talk to Lynette first to start the detective games and uncover everything.

You will play a detective game with Lynette. For the first one where you'll choose the option 'About what we found in Poisson...'

1. Interpret everything until you can Associate 'The end of "Lefevere" and 'The pet handoff.'
2. Interpret and Submit Conclusion 'Initial suspicions.'

After that, choose the option 'About Bernard's letter...' for a second round of detective games.

1. Interpret and Submit Conclusion 'The letter's delivery method.'

Lastly, choose the option 'There's an unexplained part in the operations of this trafficking ring...'

1. Interpret and Submit Conclusion 'Ingredients.'

1. Interpret everything and Associate 'Does Pierre have multiple personalities?' and 'The accomplice that was never met.'

2. Submit Conclusion 'There's still a third person out there.'

Falling Into Layers of Fog - (When you catch up to Bernand)

Talk to Elodie without talking to Lynette first. You will have a lack of evidence to further investigate and won't be able to reach the Check Objective when using Fateometer.

A Decision - (When Lynette uses the Fateometer)

Choose the option: How about... you do neither?

After that, make sure to get a card above 10. Retry this until you get it since it's really just based on luck. Then, you will get the ending.

1) Indicators of Fate
Complete the whole event and get all 5 endings.

2) Speedrun
Get ending 5 "Standby Mode" and you will get this achievement.

3) Decks & Detectives
Get ending 3 "Adventurers, Investigators, and Cats" and you will get this achievement.