Pyrotechnics Expert Trophy/AchievementThis can be unlocked on any difficulty and requires you to have 3 enemies on fire with a single Flamethrower attack. For this you will need to purchase the
Flamethrower skill from the
Tech Tree.
The best place to do this is when you are on EOS and are linking the alien ruins together. You will come to a Kett base and see multiple ships flying in. A ship will drop a bunch of enemies on the the roof so quickly run to the rooftop and activate your flamethrower to get the achievement. If you fail simply reload checkpoint and try again.
If your misplaced your skills, you can always respec in the Med Bay on the Tempest.For better understanding, here is a easy to follow video of myself attaining it.