I thought it might be interesting to post that the "Weapon Collector" trophy is kinda bugged, but there is a solution.
(Should anyone run into this problem in the future.)
The unlock list tells you that in order to unlock the B-17G and its loadouts, you will need to:
B-17G- default || Win 30 Online Strike games on any bomber
- 16 x 500 lb bombs || Win 5 Online Strike games on B-17G OR Kill 5 ground targets in Online games on B-17G
- 2 x 2000 lb bombs || Win 15 Online Strike games on B-17G
- 8 x 1000 lb bombs || Win 10 Online Strike games on B-17G
In reality though, the 8 x 1000 lb bombs unlock as soon as you unlock the B-17G aircraft and the 2 x 2000 lb bombs unlock after 10 strike wins with the B-17G.
This leads people to believe that they have unlocked all the weapon loadouts and that it's just a typo in the list.
But the game doesn't count the 8 x 1000 lb bombs as being unlocked!
(Even though they will show up as unlocked in the hangar and you're able to use them in-game.)
You will need to play a total of 15 strike wins with the B-17G! Only at this point will the game really count it as being unlocked and only then will the trophy pop up!!!
I'm unsure if this glitch was present before the patch or if it's only been present post-patch. Since I played and won a lot more than 15 strike matches with the B-17G (and I'm sure a lot of people did), this could have gone unnoticed easily.
This glitch is present on the PS3 version of the game, but if it was already there pre-patch, it might very well be present on the Xbox version as well.
Hope this helps.
(Not sure if a mod could add a note about this in the stickied unlock list? Since this thread won't get as much views as the stickied unlock list itself.)