Mission 10 The Gulag
Half way through the mission you will enter a room with a bunch of weapons, including a riot shield. Defend the room for a bit and then move forward with the riot shield and eliminate in enemy with a melee attack. Reload checkpoints as needed.
Here is a video guide with English commentary!
Here is a playlist of guides for this game!https://www.youtube.com/playlist?list=PL-HeW6XkKdUK97oYVSMU7...