This is the one where you have to complete a mission by dealing damage only with construct turrets.

I can't get it to work!

I'm using only Tarantula Turrets with the standard Boltguns. I'm not wearing any equipment that causes things to to explode on death or similar. I'm fighting away from any explosive barrels or things that can cause damage.

Any suggestions for what I am doing wrong, or is it broken?