On Long Night of Solace when I try to pick up the Data Pad that’s next to the marine it let’s me read it but doesn’t unlock the achievement, I’ve tried reading it for 3 minutes on each difficulty but it doesn’t do anything
There has been some achievements not working for some people.
Exp. I can’t get the “I’m sorry, Dave” achievement and a few others, but other people got them no issue.
You must be one of the rare ones I suppose. 
Hopefully 343i fixs this soon.