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I never saw any timeline for the HH.
But I can roughly set the books in order.
1°/ Horus Rising - the ascension of Horus, mainly takes place during the Great Crusade
2°/ False Gods - the last days of the Great Crusade, Horus' fall to Chaos on Davin.
3°/ Galaxy in Flames - the beginning of the HH, the first Istvaan massacre.
4°/ Flight of the Eisenstein - the second Istvaan massacre, the escape of Garro and the revealing of the HH to the Emperor.
These four books roughly follow each other, and center on Horus' fall from grace. You can add to this list the audiobook Legion of One which, AFAIK, describes Garro's life after Flight of the Eisenstein.
Then comes Nemesis, Fulgrim, Mechanicum, Battle for the Abyss, the two DA books and the two SW/TS books. These novels describe events spreading over the course of many years, before and during the HH. Each book tells its own story, focused on a particular aspect of the HH.
Battle for the Abyss, for instance, describes the hunt and the destruction of the Abyss, a word bearer battleship sent on a route to destroy Maccrage.
And finally, there are the three collections of short stories: Tales of Heresy, Age of Darkness and The First Heretic. These three books gather various stories happening at different times and places, with different characters, and thus can't really be placed on a timeline.
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