Got to the final phase twice in my first 35 minutes with this challenge. It seems like it will be much easier than Challenge # 4 which took over 6 hours. It starts out super aggressive but shooting a grenade makes the first phase easy, though it can take some attempts to get the placement and shot right.
The main things I have to get down is a consistant method to deal with the 3 drill romanovs in the 4th phase (without using all my shit) and how to kill the Argus robot the fastest in the final phase. I havent fought the large robots in a while so dont remember the quickest way to kill them. I came back to this game after a very long break and went straight to the challenges.
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