Difficulty: Easyish
This is story related and unmissable. However, it can be tricky due to the boss at the end.
If you struggle with the boss it has a weakness to fire. Bomb it, shoot it's glowing weak points, or use the exploding containers.
Alternatively trap it in the oven near the end for an instant kill (on lower difficulties).
Note: The oven requires the right timing but it's not that difficult.