Mass Effect 2
Simply use gibbed save editor, open it up, open your save (Back it up first of course.) then go to the Skills/Upgrades tab. Click the '+' next to Weapons-bonus, you will see a few options change the value from 0 to 2 to get all the weapons from the Collector ship, and even the special training if you are a Biotic like me. (Adept class.)
However, be warned, if you give yourself all training being a Biotic, you cannot use a heavy weapon again for some reason. Your character is not meant to carry all those weapons I assume, being a Biotic.
To get Gibbed's ME2 Save Editor, go here Link
[Edited by Lizml86, 2/10/2012 9:38:40 AM]
Just copy and paste the weapon loadouts from the .ini I linked over the entries in your own.
Those are their names, not sure on what that particular .ini uses to unlock them from the get-go, as I usually set them to unlock when I unlocked the hand cannon.