Metal Arms: Glitch in the System/Into the Trenches

The first titan can be skipped, as long as you get it get out of the tunnel first. In the time it takes the titan to do this, grab the emp for later.

The second and third titans don't need to be destroyed, although the third can be difficult to get past without nearly full health. If you are less than half health, simply kill it with an emp and rockets.

The fourth and fifth titans are in the last room, with the fifth spawning when you hit the ground