Hey there!
The problem with the "Deal damage with the Incendiary Airburst Launcher as Support" is that only direct projectile hits count as this moment. Meaning the projectile has to directly hit an enemy for it to count as dealt damage.
This is the hard way to do it.
The easier way to complete the challenge is the following:
Spawn in as a engineer and get your hands on a car (I sugest conquest) park the car somewhere and place pressure mines around it and one in front of the car. Redeploy as the Support class and shoot the pressure mines with the Inc. launcher. It takes a few tries but eventually the mines explode, dealing 1000 damage that counts towards the challenge.
Means two tries of this and the mission is done.
This worked for me thanks a lot
