So I've actually had this "bug" for a while now in survival mode. I was doing a survival world and got really far, and the only achievements that unlocked were "Getting wood," and "Benchmarking." I've gotten super far and still no achievements like "Time to Mine" or "Time to Strike." I'm concerned because all of the super easy achievements are not getting unlocked, and the game doesn't feel complete without them.
Minecraft 1.9.2 achievements not working?
Trio 14.04.2016
Try switching to 1.8 and see if the achievements work. Then try 1.9. If 1.9 doesn't work, its a bug they need to fix, I think that would be all? I don't play survival, but I would assume its a glitch. Hope your achievements get fixed soon, so your game can feel complete. Maybe go to mojang and make a bug report/ticket?
Jorge daniel 15.04.2016