Update:
I did buy the decimation pack just yesterday and noticed that eventhough I have 2 extra weapon, my weapons in operative status still 20/22.. I don't understand what are the other 2 that I'm missing?? I already unlock all the weapon that I could possibly unlock.
I did have all the original 20 weapons and also 2 extra from the Decimation DLC Pack, but still the trophy didn't unlock and my operative status still said 20/22 weapons.
Edit:
- YenRou told me that the last two weapons that missing are the cell camo weapons that you get from rebooting.
- For people wondering if DLC will help with Tooled Up, I can confirm that DLC are
NOT required to unlock the trophy.