To finish Metro Exodus 100 percent and unlock the Platinum Trophy, you must unlock all of trophies/achievements. In this guide we clarify the task to you:
Take part in the tea party on the TAIGA degree of the Admiral.
An overview of all trophies and accomplishments can be located here.
TAIGA – Tea Party
The place is part of the story progression in this level. So you can not miss it. Basically, you have to sit down, play with the guitar after a while and wait for the admiral to sleep. It all takes about 8-10 minutes. At the table you can drink a cup of tea.