For this you need to complete any challenge without healing (using nanotech). Easiest challenge by far is Valley of Heroes and play on couch potato.
There's 1 landstalker turret so use the EMP ability to deactivate it and destroy it. Then use the EMP ability to disable the electric shock on the platforms you have to jump on to get to the jump pad.
Best weapon to this with is the Harbinger/Mega Supernova