So, I am now certain that I have hit the 40 completed research topics by Sol 100 Milestone. It is Sol 75 and my research screen looks thus:

Count 'em. Even by my most conservative assumption - that Breakthroughs don't count toward the 40 and nor does the free Sensor Tower upgrade I got from Futurist - I now how 40 topics researched.
... Nothing has happened. My Milestone screen also still lacks a tick beside 'Evaluation', and I have of course had both the initial narrative pop-up asking me to go for 40 by 100, and the 'Time's running out to complete your milestone' pop up as well.
Am I missing something? Or have I hit some kind of bug?

Count 'em. Even by my most conservative assumption - that Breakthroughs don't count toward the 40 and nor does the free Sensor Tower upgrade I got from Futurist - I now how 40 topics researched.
... Nothing has happened. My Milestone screen also still lacks a tick beside 'Evaluation', and I have of course had both the initial narrative pop-up asking me to go for 40 by 100, and the 'Time's running out to complete your milestone' pop up as well.
Am I missing something? Or have I hit some kind of bug?