Alright folks.. time to put in my two cents.. I believe my way is the easiest when doing it on solo or even with two ppl.. but solo is the way to go. I got this achievement by round 4 on my own.
1./ start up a game. When the game starts, look up to see if the weapon box is in front of the lighthouse. If it is not, RESTART. Keep restarting until the box is infront of the light house. You can tell if it is there by a beam of blue light!!
2./ Start by killing zombies. To get max points, shoot them 3X and then knife them. Leave ONE zombie in round 2, you should have enough points to clear the boat (750) and buy one weapon out of the box.
2B./ Here is the tricky part. If you get a Ray Gun/Scavenger, you are set. If you do not, beat this round and play the next round and save up money for the box. Again, leave ONE zombie in round 3 and check the box. You should have enough money to buy 2 weapons. If you DON'T get the ray gun or scavenger, I suggest start over as round 1-3 are very easy. Round 4 and 5 are too but some ppl. aren't that good.
3./ Now, that you have the Ray Gun or Scavenger. You can almost kill George with it. However, neither of these weapons is still enough to kill him. I had the ray gun and by the time I unloaded the whole thing on him, he started to flash orange. I was on round 3 and I also had the FN FAL. I unloaded this on him and it still was not enough. So I had to go to round 4 and get enough money to buy 2 more guns and unloaded them on him and he DIED!!!!!!!!!!
This is a REALLY EASY achievement to do on your own.. it just takes a long ass time.
Here are some tips...
a/ When using the ray gun or the scavenger, BE CAREFUL NOT to kill the loan zombie as he gets really close to George, especially if you have the scavenger. One way to avoid this is to shoot George when he is on land and let him chase you around the circle (start area) and make your way to the REVIVE machine, turn around and unload on him. This way, he will run fast pat the loan zombie.. keep doing this until he dies to avoid killing zombie.
b. You DO NOT, I repeat DO NOT have to upgrade anything. Upgrading takes time and money and you have to turn on the power, find the PAP which means you have to open doors, save more money, kill more zombies, get to harder waves.. its stupid.
I hope this helps you ppl. Trust me, its an easy achievement and much easier doing to solo as you can restart fast if the box is not infront of the lighthouse. :)