On this page of our trophy guide to Wolfenstein: Youngblood you will find a description of the Tribute achievement. This brown trophy is awarded for obtaining souvenirs from Dunwall.
To achieve this goal you will need Dieselkraftwerk. You will get it during the Brother 2 story mission. If you are not yet able to complete this task you can get the enemy's weapon, however, you need the ability - Bigger Guns from the Muscle category. It costs 4 skill points and allows you to lift heavy weapons that have been dropped by defeated enemies.
The souvenir from Dunwall is located in an area called Victory Boulevard. You have to go into one of the buildings and find a locked door. They are very specific because they have a weapon drawn on them that will allow you to open them.
If you have Dieselkraftwerk, just shoot at the door, and another room will stand in front of you.
There is a small chapel in the room. Go to it and collect the souvenir. Thus, the achievement will be automatically unlocked.
In the same room you will find a red box, which we have described on the page with secrets available in this location.