Had the same problem, 3 of my achievements were unlocking so i looked on here and followed what someone said and it worked. Delete saved game and/or clear cache and start over and after 2 long games they appeared

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Next game purchases in no specific order:

Army of Two: The 40th Day
Lost Planet 2
MagnaCarta 2
Operation Flashpoint 2

Im having problems with the pop quiz cheevos,anyone else have this problem?

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Think of me what you will I got a little space to fill

Okay , i followed what everyone else did, erase your game and start anew. and i got 2 of the 4 cheevos. Now im trying for the 40 question cheevo, does that mean 40 correct answers over time or 40 questions in a row , like  10 straight correct , then another 10 straight correct and so on? cause after i erased everything i was keeping tally and im well over the 40 especially getting anywhere between 7 - 8 correct over 5 games and one of them being the 10 straight! does the online pop quiz question block count towards the tally?

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Think of me what you will I got a little space to fill

Just play 2 full games and make sure u answer em all correctly, shud unlock then.

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Next game purchases in no specific order:

Army of Two: The 40th Day
Lost Planet 2
MagnaCarta 2
Operation Flashpoint 2

Tried it still nothing........and if i read the description correctly it sounds to as if its 40 questions for "actors" and another 40 for "directors" bringing the total to 80 questions. being that i have played enough games for the 40
i am begining to believe its 80 total to include both groups, which would explain why we need 60 questions for the "best Picture" Cheevo

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Think of me what you will I got a little space to fill