I have started a new world in survival and killed a pig and cooked the raw meat he dropped and ate it and have not gotten the Xbox Achievement "Pork Chop". I have done this on two different survival worlds and still have not gotten the achievement.

As a side note, recently I was looking to get all 17 Biomes to get the "Adventuring Time" achievement. I had 16 biomes and only needed one more. Yesterday, while playing the PC Java version with my brother on my private 1.9.4 server, we went into the Nether for the first time and I got the Windows 10 Edition Beta Xbox achievement "Adventuring Time". That was a cross-version/platform incident. I still don't know how that could happen...

I have not been able to try other non-completed achievements to see if this applies to others yet. I have already completed 25 achievements so far so maybe this is an isolated occurrence.