Hello,
I made a walkthrough of a video of the spear of adun mission - sprinter cell achievement walkthrough.
This is one of the harder brutal mission achievement where you only get very basic units and limited resources to beat the game under 15 min mark (For 'Sprinter Cell' achievement). This is a walkthrough for a player who is trying all achievements only on BRUTAL difficulty.
This mission is difficult since you can only create zealot and stalker with maximum upgrade of 1-1-1 whilst your enemy gets 2-2. There are also no expo location and need to beat the game under 15min mark.
I have yet to seen anyone else on youtube beating the game under 15 min mark. They all tend to take around 30 min which I also did in my first playthrough.
Hope this helps.