In Utter Darkness (Achievements) | Campaign - Prophesy missions SC II: WoL Guide
Last update: 11 May 2016
In Utter Darkness:
Destroy 1500 Enemies, Protect the Protoss Archive for 25:00, Defend Until the Last Protoss Falls.
Semi-Glorious:
Read the main description of the mission and I'm sure you will make it. Basically, start upgrading and producing various units from the very beginning, to have a strong and varied army. Though you might want to look at the Dark Templars more favourable.
Just as I suggested before, it's good to split your forces into two groups and place them on both sides of the Archive, thanks to which you'll be able to quickly react to enemies coming from both sides. Search for the enemy's air units with your Phoenixes and shoot them down once they reach the outer Photon Cannons. Once you have more than 600 Zergs on your account, Nydus Worms will start spawning inside your base. That's why you should spend any crystal excesses on Photon Cannons, placing a tight network in the productive part, as well as on the courtyard. Replenish the shortages in you need, including those on hills, attacked by, e.g., Mutalisks.
Once the counter shows around 1000, Overseers, who can detect Dark Templars, will start appearing. For them not to fall into trouble, send Phoenixes to deal with the Overseers, and later on with Brood Lords as well.
After breaking 1500, the enemy will start using much heavier units. Hybrids will grow in numbers and additionally numerous Ultralisks will appear. Destroying the detectors might increase your chances, but it shouldn't be your priority. Destroy the Overseers when you have an occasion.
From time to time, check if the Carriers aren't low on Interceptors and use the data provided by Observers. Have them watch over the roads like in the beginning, though move them a bit to the side, so that they don't get shot down once Overseers start appearing. Use the cloak ability of Artanis Mothership as well. The target if of course 1750 Zergs.
Blaze of Glory:
The achievement is earned on normal. If you manage to gain it, the Protosses will vanish in a really epic fight. I don't think there's much to add to the above description. Around the Semi-Glorious level, Corruptors will start appearing more often, threatening Phoenixes and Colossuses most of all.
After the counter exceeds 2000, you might go through a small mental breakdown after you see what's going on, but if you made it here while maintaining a high population level, you should be able to reach 2250 Zergs.