Board Thread:Questions and Answers/@comment-25567355-20170109141958/@comment-16461120-20170113213847

It's unclear exactly how much they remember, though clearly characters like Mike Miller do appear to remember the world was ending; however, there's largely no furtherance of future plot by wasting story time with dialogue about what people recall concerning a single panel in a past issue, so we'll probably never get clarification on most of this.

Anyway, keep in mind the multiverse and everyone in its death and rebirth would have been instantaneous from the in universe perspective of most, so the disaster was seemingly averted in the blink of an eye, not following eight years of Secret Wars.

In terms of those who might remember the entire event...

Earth-1610 characters who survived the final incursion to take part in the Secret War:
 * Miles Morales
 * The Maker

Earth-616 characters who survived the final incursion to take part in the Secret War:
 * Carol Danvers - Death in
 * Corvus Glaive
 * Jane Foster
 * Maximus the Mad - Apparent death in
 * Namor
 * Owen Reece
 * Peter Parker
 * Peter Quill - Apparent death in
 * Proxima Midnight
 * Reed Richards
 * Scott Summers - Death in
 * Stephen Strange - Death in
 * T'Challa
 * Thanos - Death in
 * Victor von Doom

So we're talking about less than a dozen characters from Earth-616 and Earth-1610 who might recall Secret Wars.