Killing part of a squad (e.g. killing five of the ten individuals) does not appear to add to the counter.

So, rather than restart, I switched to a strategy of researching to orbital deployment and Terminators. I built one Chaplain and one Captain, and kitted them both out in armor, weapons, and the indispensable Zoat Hide. With two Terminators, I teleported all four units to their Headquarters (after refreshing the scan). Fortunately, the city hadn’t expanded much and I was able to land just outside the city, and partially surround the building. The Chaplain is possibly the most durable unit in the game, and managed to survive five turns of concentrated fire before dying. In the meantime, a unit of Space Marines with Melta Bombs, the two Terminators, and a summoned Fortress of Redemption wore down the Headquarters until…victory! More units. More targets would have created more “damage soaks” for my key Terminators, who were very effective at city killing. Waited until my chaplain would have been created at level 6. At that level, he could heal himself and surrounding units, rendering them nearly immortal. The starting level of heroes depends on a formula which combines the number of turns and game speed, so a faster setting would have helped here as well. In general, achievements requiring a total number as a goal can be done over the course of multiple games.

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The Practical Side - Getting the AchievementFirst, research Ministorum Indoctrination and Universal Indoctrination. Then, build two Avenger Strike Fighters. You'll need to use enemy overwatch to make this work. Understanding the Techs and Traits Involved Avenging Zeal is granted by any unit with Martyr Spirit to a unit with Shield of Faith. Initially this includes only infantry. Avenging Zeal is triggered by the death of unit with Martyr Spirit and then a one-turn buff called "Avenging Zeal" is granted to all adjacent (i.e. in a hex directly next to) units which have Shield of Faith. The purpose of this achievement is to maximize the Tau’s unique loyalty bonus from not duplicating buildings. Build just one of each type of building to get it; the highest tier building is the aircraft factory. There is no way to deconstruct a building once it's done, so if you accidentally overbuild, you'll need a new city (or a saved game). I thought I might have lost the game when the first Aeldar Wave Serpent showed up, but fortunately they are quite vulnerable to my units, and it didn’t make much of a difference. Sweet victory, at last! By the time you get them, you can probably have researched a useful boon or three, and they might get even better with a bit of RNG.

The Pariah Nexus propagation is a star-spanning weapon of cosmic potency that the aeons-old minds behind its creation hope might forever end the threat of Chaos to the galaxy. That this great victory would come at the price of the soul-death of every living creature in the Milky Way, the Necrons simply view as providence. Sure Havocs with all boons and mark + icon can be very good. But when will you get a squad of Havoc with all boons surviving long enough to have a meaningful impact? One particularly good use, if you have a unit of Havocs or Obliterators with the Mark of Slaanesh, is to combine it with Endless Cacophony. It may set you ba c k three Command Points for the privilege, but you’ll deliver two devastating volleys that your opponent won’t soon forget. It turns average units into incredibly powerful killers. It can be the difference between "Damn, I need two Helbrutes to kill this tank" and "Tank goes boom".If they have an enormous amount of units, try to play with the AI forgetting you exist in the fog of war to catch vehicles one by one, slaughter them with Daemonforge activated (or meltas if you really can't get vehicles out) and then retreat. That only works if you have enough forest/rivers/ a good amount of marks of slaanesh.

Necrons - Gauss PylonThe mysterious Necron defence turrets, designated as 'Pylons' by those who originally encountered them, were first recorded on the uncharged world of WDY-272. Rising suddenly from the desert sands, the Gauss Pylons opened fire without warning and with devastating effect, tanks and armoured carriers burning as the crescent-shaped weapons tore through the unsuspecting Imperial Guard column whilst resisting all return fire. Universal Indoctrination (a Tier 9 technology) grants Avenger Strike Fighters the Shield of Faith, which now allows them to receive the Avenging Zeal trait on death of another unit with Martyr Spirit. If you face a biological army (Tyranids or T'au with battlesuits for example, you will LOVE their jump that blinds everything around them. Use a normal progression to survive, and build Warp Talons when they are available. They're worth it.Bloody Resolution is a trait unique to Saint Celestine, which grants all allied Sororitas units complete protection against morale loss if the Saint dies. This sounds great in theory (for the achievement) but she is very hard to kill. Somehow, these structures are channelling the star's power into the vast, maddening network of pylons -- a contra-immaterial nodal matrix as the Necrons' arcane architects refer to it. The pylons' purpose is to sustain and extend a field of negatively-charged, anti-empyric energies, and it was the interstice before this field that the forces of the Imperium encountered as a shimmering veil around the Pariah Nexus. As Drukhari, win a game with an allied Craftworld Aeldari on medium difficulty against a team of Adepta Sororitas, Adeptus Mechanicus, Astra Militarum and Space Marines on impossible difficulty. This can aslo be completed in multiplayer. The mysterious Necron defence turrets, designated as 'Pylons' by those who originally encountered them, were first recorded on the uncharged world of WDY-272. Rising suddenly from the desert sands, the Gauss Pylons opened fire without warning and with devastating effect, tanks and armoured carriers burning as the crescent-shaped weapons tore through the unsuspecting Imperial Guard column whilst resisting all return fire. Boons are an important investment in research and they are STILL RNG (you're not sure to get one when you kill, and you're not sure to get the most interesting one).

The dark disciples were also added. They... exist I guess. Not a fan of them (Chaos cultists are easier to use as you can just send them to the front AND they can spawn a Noctilith Crown to ♥♥♥♥ with ennemies). I've attached the minimap of the world I settled on after about five restarts (this is the final turn). I'm the teal units in the lower right. I knew the map was good when I started, but it turned out to be absolutely ideal! Because I started with a lot of land, I knew all that water would be crowding the AI. So why is this so ideal? The reference is a little obscure, but the achievement is straightforward…use any T’au unit labeled “Battlesuit” (e.g. XV8 Crisis Battlesuits) to get the killing blow on a Dreadnought, which is a Space Marine armored walker unit. Dreadnoughts do not appear in the campaign story, so you’ll need to face off against an AI opponent.

You WANT to make him make Spawns. Sure, Spawns aren't that good, but if you get them for free? Why wouldn't you! While this isn’t technically a unit, this Stratagem is probably one of the best in the game and changes the way that this army plays so significantly that it deserves its own entry. What’s important is deciding which unit you need to use it on every turn – yes, it’s that good, you should be using it at least once a turn (and remember that it can be used to affect shooting and melee)! It's overall a very heavy investment, relying on then further RNG, when vehicles are good immediately.