i am not sure if anybody will ever read this but some hints for the hard achievement: dont loose hp with the primary gun and don't waste money for aidkids, buy a shotgun 5k gun and after go for the minigun, try to stay in the middle of the map and get fast opponents first, you will get 5k points per day survived + points what you have so dont waste them for some random guns, at day 16 you should have enough points to win