Chimera Bloc-9 Mission is Killing me

I have been nonstop trying to complete this dumb mission for 2 days straight with the maus. Ive come close a couple of times but no luck. I either complete the 2,5k damage requirement or the damage blocking requirement, but not both. Im really fed up with this mission already because it forces me to play like an idiot, intentionally exposing myself just to get bots to shoot at me and trying my luck.

Its genuinely frustrating and infuriating and I dont know what Im doing wrong. advice?