Day 48, I got the "Pre-alpha Completed" achievement.
There was no reason to drag me any further than the last big obvious event at around day 35-38 and then give me the achievement. I either got the same spooky signals or a single event per day that lasted for a second. The pacing of the story mode related events were great, but things really did start to die down and honestly, could have been given the achievement a while ago.
It was REALLY building up as well, so I was anticipating some kind of cliffhanger ending, sticking around for 10+ more days, and it just... trickles down and then gives me the "completed" achievement.
I know there is a lot more stuff to find, but by golly do I not feel like it. Will play again in a future update, will come to support the dev.