I found a few tips here:
A good tip was to not do too well on the early waves, because every
civilian left alive is another zombie you'll have to kill later when
you will already have too many zombies to kill. Let most of the people
die early; as long as a single one is left alive, you don't lose. An
even better tip was that the game speed modifiers from the main game
work in this mode. Use the space bar or plus and minus to reduce the
speed as low as ten percent and it becomes a cakewalk. And if the
achievement doesn't pop up, start a new campaign, go into the first
area, and concede.
And a few more here:
Some tips on how to beat the waves: you have 40-50 seconds per wave
and the only way to lose a wave is to let the time expire or lose all
of your humans. A major outbreak could end it for you in the later
stages if the zombies infect a giant pack of humans (which they almost
certainly will).
The best way I've found to deal with an outbreaks is, in the earlier
stages when you have plenty of time to spare, just let the zombies
infect a manageable amount of humans; so you'll have less of them to
worry about latter on. If you do this you shouldn't have much of a
need for bombs and can neglect picking them up if there's something
else you need to focus on.
This took me about 20 minutes of play to achieve (although I've played the game plenty before, so know how it all works), so it should be fairly straight forward to achieve even if you're new to the game.
If you look at the wiki (or the XML file, or the in-game crafting menu) you will see that Diggle Nog can be crafted using a Porta-Still and combination of Aqua Vitae, a Diggle Egg and some Grog.
Therefore, to get the achievement you need to find all three craft items and a Porta-Still to combine them with. Craft them together and that's your achievement.
So, to minimize the time to get this achievement I'd highly recommend starting with the Alchemy skill so that you start with some Aqua Vitae (which will probably be in your quick bar, not your inventory) and a Porta-Still. You'll then need to find the other two items yourself, but they're fairly common items that you should be able to find somewhere on the first level.
Keep on the lookout for Drink Machines:
If you take Burglary as a skill, you can steal random liquor from drink machines, which may speed up your acquisition of the Grog. Otherwise, check each one you find to see if they're selling any.
Diggle Eggs are found frequently in Diggle Nests, which are small rooms containing a couple of Diggles and usually nests filled with eggs:
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