That is why this forum is confusing, you guys talk about things, but there is no place to just get an answer for it. Above someone else said each time someone is made a god there is a dragonbreak, but you say nope that does not happen:)
And the whole Godhead and CHIM thing, it was 3 pages in the thread yesterday before someone even gave the simplest of definitions. You all need to be a little less cryptic:)
Sorry about that, it's a natural result of any environment with specialized knowledge.
A dragon break just occurs when the structure of linear time (or the God associated with it) is broken. This has coincided with apotheosis in the past, but the two aren't necessarily linked.
In the case of the Tribunal, it was because their timelines were modified by their divinity to allow for them to have always existed as Gods while still having been the temporal mortals that became gods. Sort of a necessary logical paradox, in a way. The dragon break is the resolution of that paradox.
I don't
think time was broken when Talos ascended, but I don't know enough to say.
Anyways, as for a list, the ones I'm aware of are the Marukhati Selective's dance on the tower, The apotheosis of the Tribunal (and the disappearance of the Dwemer? Not sure how Numidium relates to dragonbreaks), the Warp in the West, and maybe the Siege of Alinor and in the Halls of the Colossus at Rimmen when Tiber activated Numidium (again, not sure about Numidium).