So yeah as I finally got to play Ubisoft's Assassin's Creed 2 I ran across a possible glitch in the system and am curious if any other people have ran across this with the PS3 Trophies or XBox achievements.

As I made my way through the game I was collecting the general advancement trophies. Finally when I got to DNA sequence 14 I went to my trophies and looked and sure enough it states that I never completed DNA sequences 8&9.

Figured, meh, it might go ahead and give me the trophies after the final save (after the credits roll) and sure as hell enough, it DIDN'T.

Now I am not a trophy collector or anything like that but if they are going to put them into game they should at least work. Now if I want to get all of them I have to go through the first half of the game once again.

[/rant]

So I am curious if something similar has happened to you on any game and what you had to do to resolve it or if you even cared enough to go back and take care of it.

Also any ideas as to what might of caused a glitch like this would be appreciated.