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For the gun addicted achievement just go into warm-up and do for some hours something else, if you did the kar k achievement you have it in the beast mode, so everything you shoot gets killed instantly (very handy for efficiency as well as offensive campaign).
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@Godoodle Its not impossible, maybe your computer is too slow and you maybe have to close all the other applications and in the accuracy challenge you just need skill I can't help you there (I did it too and I could get all of the achievements).
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as well as i figured out the recoil on my own and was gonna provide the tip but seen it was already at top when i was gonna do so but heres another tip, go to options and select (30 bullets on screen) in defense mode nearing the end most of the targets will roll on the ground, if there are bullets on ground and targets roll over them it counts as a free (1) hit when sometimes when you fire you can do 0 damage so its useful to do it this way =P hope it helps if anyone is having problems although no one should =P
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@kirayamamoto The beast mode on the Kar 98K makes the bullets a one-hit kill. It even kills the level 7 offense campaign enemy in one shot.
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The game has a memory leak. You seriously need to fix that. It took less than half an hour before this game used 1gb of ram. I had to close the tab it was on and start it up again for it to start over again. But it's been three times now when I've had to do that because the game starts lagging badly. The guns reloads start taking 5+ seconds randomly, the rifle shooting with the Kar takes 3-5+ to shoot again. While the time still goes normally. Fix the memory leak!
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For Gun Nut Achievement you have to be in the shooting screen, so just klick warm-up and do something else for 4 Hours