Great guide, Nozza.
Thought you may want to know for the "Love the Boom" Achievement - Kill 4 enemies simultaneously with one explosion. I found an easier way to do it.
The Trial of the Rakyat located at 756.5, 746.0
It's a trial where you have to get kills with an RPG. There are a couple times where I got multiple kills with one rocket. That's where I unlocked the achievement. For those who are fighting the other way.