Perfect Dark Zero

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Unlock Dark Agent
Beat the game on Perfect Agent mode.
Unlock weapons to bring into other missions
In order to unlock a weapon, you need to start a level that has that weapon in it, find that weapon, and finish the level with it. Simulations such as the level 0 are an exception; you don't get to keep the weapons, because they are not real
The following list is most unlockable weapons, the type of weapon, and the amount of carrying capacity that it takes up. In the second column is the mission that the weapon first appears in.
The viblade is in the room with all the laser tripwires, on a stand in the centre
The M60 can be taken from a guard when you fail to get let in by the front gate guard
Oh, and sniper take up 3 inventory spaces, making them unwieldy, but the jackal and shockwave can be found in rooftops escape, and bridge assault respectively.

Unlockables
Falcon (Pistol 1) Nightclub Stakeout
Magnum (Pistol 1) Rooftops Escape
Magsec 4 (Pistol 1) Mansion Infiltration
Phychosis Gun (Pistol 1) Trinity Infiltration
M60 (Heavy 3) Mansion Infiltration
Plasma Rifle (Heavy 3) Temple Surveillance
Rocket Launcher (Heavy 3) Bridge Assault
DW-P5 (SMG 2) Nightclub Stakeout
UGL Liberator (SMG 2) Nightclub Stakeout
CMP-150 (SMG 2) Sewer Retrieval
RCP-90 (SMG 2) Jungle Storm
KSI-74 (Assault 2) Lab Rescue
FAC-16 (Assault 2) Trinity Escape (off dead ally)
SuperDragon (Assault 2) Outpost Rescue
Laptop (Assault 2) Trinity Infiltration
Viblade (Close Combat 1) Mansion Infiltration (red triplaser room)
DEF-12 Shotgun (Close Combat 2) Nightclub Stakeout
Combat Sheild (Sheild 1) Trinity Infiltraiton
Frag Grenade (Thrown 1*5) Nightclub Stakeout
Multi Mine (Thrown 1*5) Temple Surveillance
Hawk Boomerang (Thrown 1) Rooftops Escape

Achievements
You can get achievements for doing certain tasks in single play and multiplay modes. These achievements count to your gamerscore for your gamercard.

Also works with XBOX Live

There are 50 in all and will give you 1000 gamerscore points in all.