The hardest in-game achievements for me were:
1. Get 100 fast kills, but Mario543 gave a good hint to pick a browning and use Z/X buttons, when you feel, your clip is getting empty very soon - in this way you will avoid reloading. I also used minigun.
2. Gone in 30 seconds. My way to get it was: play selectioner (hope for 3 kinds of zombies not 4). Start killing your targets with some good weapon (browning/minigun) and after 10+ seconds use nuke, shoot, then again kill some targets with your fav weapon and about 28 second use nuke and shoot it again. With some luck you can get the job done.
First i've played Epic Battle Fantasy 3, so i've expected more.
Not a bad game anyway, but the last boss is too much overpowered... I've got both of my chars to full hp, then sonic boom killed the girl and right after that (without my turn) the boss finished the guy in 1 hit. How was i supposed to survive? It was just the normal setting btw.
3640 in something about 5th attempt to survival mode badge. My hint is: Use the rope attack a lot (up+down arrows). Kills few cats in longer range in 1 hit and gives you big chance to ear a life or two. Not to mention, you clear a lot of space and get nice loot.
I would have won this war. AAA gun was about to arrive, but something about 10 Germans have overran our position... they are probably enough to take out the army behind us.