Resident Evil Revelations 2

In Raid mode missions, you'll find large chests containing weapons or parts in the form of vinyls - which will usually be displayed as something like 'Magnum ?????', for example.

To evaluate whatever items you have found, simply go to the jukebox which is located to the left of the red door in the Raid mode room, and press whilst having any of your items selected.

This will reveal the items true stats & net you the achievement!