Hi @Arkenophas
This is only a campaign achievement. I picked this up on my second run at the campaign as I missed out on it the first time due to failing the second part.
There are two quests that are needed to be completed successfully and it is a little tricky (well it was for me anyway 
1. You have to complete the quests that ask you to catch the arsonists in your town (ditchwater) that's the fire part, this quest might be repated 2 - 3 times. Make sure you catch all the arsonists (there are 5 to be found each time walking around your city and you have approx. 2 min to find them.
2. The rescue part is you have to pick up the escaped civilians from bright sands by not being noticed by the phyphrion patrols and taking them back to your town. You also have 30 min to complete this quest. (the civilians escaped through the sewer and are hiding just outside the island and there are two patrol ships going past)
I think players that rush and complete the main objective of getting rid of the phyphrion fleet quicky ends the campaign and as a result the side quest required for this achievement may not appear.
Hopes this helps
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