Wolfenstein II: The New Colossus

In total, there are twenty-four readables to find in order to unlock this achievement. More specifically, there are eight readables within each Volume.

This collectible set generally consists of notes, newspapers clippings, or journal pads that are scattered around the missions. As such, be sure to explore every inch of every area carefully. Remember, you can always check your mission collectible progress at any time by opening the Journal and referring to the menu's "Extras" tab. Likewise, the game will automatically save any collectibles that you immediately pick up, so feel free to quit the mission once you grab what you need.

Please refer below to "California Gold" for collectible video guides, courtesy of HairOnFire.