There are achievements for finding clues, I have completed all the missions so should have all the clue finding achievements, shouldn't I? For some reason Super Sleuth (for finding the final clue) has not unlocked, even though I have completed the missions on Heroic. I'd ask which clue was the "final clue" but I know ODST doesn't have linear progression with the levels and the "final clue" means find "all the clues". So will I have to go through, find each clue and play every level again?
If I was talking about the audio logs, I would have said the audio logs and the achievements related the the audio logs. The clues are the things you find to take you in to each mission. Finding all of them gives you an achievement, "Super Sleuth". I'm sure I said that in my first post... oh wait, I did. Its just I had a similar problem with Halo 3, I completed the game but if you don't complete a level in 1 sitting then you don't get the achievement for that level. However, I did complete each level without quitting, I completed the whole game in 2 sittings so I guess this is a different problem. Unless there is another clue... which I doubt seeing as I got the achievement for completing the game on Heroic
Same thing happened to my friend, Bungie still has a few glitches to fix before it's at 100% working rate. Just go through campaign again and beat all the levels. It's the only way to do it really.