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I was wondering if any Horus Heresy or 40k historians could clarify something for me.

My Legio for Adeptus Titanicus are the Legio Astorum, or the Warp Runners. As I think about painting an opposition force for them, I've gone looking for a force they fought with. To that end, I found this article on the 40k Wiki:

http://warhammer40k.wikia.com/wiki/Legio_Astorum

It specifies that, on Tallarn, the Legio Astorum fought the Legio Mortis, aka the bad guy Legio that was everywhere.

But, when I do a search for the Battle of Tallarn from multiple other sources, I see no reference to either Astorum or Mortis. Does anyone know where the fluff for their conflict comes from, that 40k wiki is referring to?

The various bits of flavour text and artwork show the Warp Runners, War Griffons, Ultramarines, Salamanders and Space Wolves, and the Death's Heads as all being at Tallarn. That was back in 1st edition, though. The wiki is using that material as its source; some of the names come from those old bits of background.

Lexicanum seems to be using the novels; that lists the titan leghions present as the War Griffons and Godbreakers, along with White Scars, Imperial Fists, Iron Hands against Iron Warriors and some Alpha Legion agents.

I had a look at the book "Tallarn" from the Heresy series. It's not too helpful I'm afraid. It's really about tanks and doesn't name many of the titan legions present. I can only find a reference to an imperial titan with pitted grey armour, and to traitor ones in black and orange.

The grey titan seems to be from Legio Gryphonicus - who are named. The Myrmidon Lords of Zelth are with them at some point, but I don't even know if those guys are titans.

I didn't search that exhaustively, but I have the ebook and entered some search tems. Searching for "legio" was most effective.

On the traitor side Legio Krytos and Fureans both make an appearance - albeit in t he latter case only when someone hides inside a Fureans reaver that's undergoing repairs.

Remember there have been two great battles on Tallarn; the first, famous one during the Heresy, that turned the old temperate agri-world world into a radioactive desert deathworld, And the second battle when the Cursus of Alganar was uncovered, which was attended by the Eldar as well.
The Imperium would want to cover both of these up, at least partially, if for no other reason than the chaos taint present at both, so it’s quite possible that any available histories conflate the two and place units that could only ever have been present at one of the separate events at both ends of the conjoined event. From which point it is then easy for later historians to mistake the combined history for one or both of the original events.
Or, in other words, if everything is ‘true’ nothing can be true.