1.2 dataDyne Research Investigation:
Double CMP150: Make it to the weapons cache near downstairs maintenance bots without being seen.
Proximity Mine: On perimeter of isotope room.

1.3 dataDyne Central Extraction:
DY357 Magnum: Take down the first five guards without being seen.
Grenade & Dragon: make it to the elevator without being detected. Kill the first guard after taking the elevator up. Use the Key Card he drops to access Cassandra's office. Make a hole in the right corner of the room to find the Dragon.

3.1 Chicago Stealth
BombSpy: Use barrels to explode dumpster near G5 building.
Double Falcon 2 (Scope): In Pond Punk bar.

4.1 Area 51 Infiltration
Double MagSec 4: Kill red guard near comms rider. He'll drop the other MagSec 4.

4.2 Area 51 Rescue
Phoenix: In secret room above hangar.
Double Falcon 2 (Silencer): Explosive barrel lodged in a stack of crates to the right of first hall.

4.3 Area 51 Escape
Remote Mines: Get Elvis to safety in under 36 seconds.
Double Falcon 2 (Scope): Behind you in the glass lab at start.

5.1 Air Base Espionage
Double DY357 Magnum: Punch out the NSA agent near the elevator to the AF1 hangar.
Proximity Mines: Near beginning of level, past the tunnel on a snowy ledge.

5.3 Crash Site Confrontation
Proximity Mine: Visit Elvis at his UFO.
Double DY357 -LX: Disarm Trent as he runs by you after rescuing the President.

6.1 Pelagic II Exploration
Double Falcon 2 (Silencer): Do not trigger an alarm. Make it to the guard four doors from the start. Kill him and he'll drop the Double Falcon.

6.2 Deep Sea Nullify Threat
Proximity Mines: Just past the tunnel after the large cavern (near beginning), kill the guard to the left. He'll cough up the mines.

7 Carrington Institute Defense
Devastator: Save a single hostage in the information center.

8 Attack Ship Covert Assault
Double Mauler: Kill the Skedar in the center of the bridge.

9 Skedar Ruins Battle Shrine
Double Phoenix: Destroy two unmarked temple targets with the Devastator. The Phoenix will appear on the ledge before the canyon.

10 Mr. Blonde's Revenge
Double CMP150: Kill Cassandra's bodyguards near the lab elevator.

11 Maian SOS
Double DY357 -LX: Kill guard in left containment room.

11 Maian SOS
Psychosis Gun: On lab table at start.

Unlocking Special Assignments

Mr. Blonde’s Revenge is unlocked by completing all solo missions in Agent difficulty or higher.

Maian SOS is unlocked by completing all solo missions in Special Agent difficulty or higher.

WAR! is unlocked by completing all solo missions in Perfect Agent difficulty.

Duel is unlocked by finding all weapons in the solo missions and gaining at least a Bronze rating on each weapon at the Carrington Institute Firing Range.

Unlock Perfect Darkness (new difficulty setting) by beating all solo missions in Perfect Agent.

Unlocking stuff in Combat Simulator

Unlocking preset games:
Unlock Hold the Briefcase by completing 2 Challenges.
Unlock Pistol One-Hit Kills by completing 3 Challenges.
Unlock Capture the Case by completing 4 Challenges.
Unlock Tranquilizer by completing 7 Challenges.
Unlock Slow Motion by completing 8 Challenges.
Unlock Temple Explosives by completing 11 Challenges.
Unlock Slayer by completing 13 Challenges.
Unlock Cloaking by completing 16 Challenges.

Unlocking scenarios:
Unlock Hold the Briefcase by completing 2 Challenges.
Unlock Capture the Case by completing 4 Challenges.

Unlocking Arenas:
Unlock Complex by completing 1 challenge.
Unlock Warehouse by completing 3 challenges.
Unlock Ravine by completing 5 challenges.
Unlock Temple by completing 6 challenges.
Unlock G5 Building by completing 9 challenges.
Unlock Grid by completing 11 challenges.
Unlock Felicity by completing 12 challenges.
Unlock Villa by completing 14 challenges.
Unlock Sewers by completing 16 challenges.
Unlock Car Park by completing 17 challenges.
Unlock Base by completing 18 challenges.
Unlock Fortress by completing 20 challenges.
Unlock Ruins by completing 22 challenges.

Unlocking Weapons:
Unlock Farsight XR-20 by completing 1 challenge.
Unlock Grenade by completing 1 challenge.
Unlock Shotgun by completing 2 challenges.
Unlock Falcon 2 (silencer) by completing 3 challenges.
Unlock SuperDragon by completing 4 challenges.
Unlock Laptop Gun by completing 5 challenges.
Unlock Remote Mine by completing 6 challenges.
Unlock Tranquilizer by completing 7 challenges.
Unlock Falcon 2 (scope) by completing 8 challenges.
Unlock Reaper by completing 9 challenges.
Unlock Cloaking Device by completing 10 challenges.
Unlock Devastator by completing 11 challenges.
Unlock Proximity Mine by completing 12 challenges.
Unlock Slayer by completing 13 challenges.
Unlock Phoenix by completing 14 challenges.
Unlock Combat Boost by completing 15 challenges.
Unlock Mauler by completing 16 challenges.
Unlock Callisto NTG by completing 17 challenges.
Unlock Crossbow by completing 18 challenges.
Unlock RC-P120 by completing 19 challenges.
Unlock DY357-LX by completing 20 challenges.
Unlock N-Bomb by completing 21 challenges.
Unlock Laser by completing 22 challenges.
Unlock X-Ray Scanner by completing 23 challenges.

Cheese Locations

Level 1 - Hidden on the 5th floor.
Level 2 - Near experiment CPU.
Level 3 - 4th floor near the Dragon.
Level 4 - In the cellar near one of the exits.
Level 5 - In a toilet in the Punk Pond bar.
Level 6 - Near the Damping Field Generator.
Level 7 - There is no cheese on this stage. No, there really isn't, even the guides don't list one in level 7.
Level 8 - Near shortcut to locker room.
Level 9 - In an empty and useless room shaped like this: [[ ]]
Level 10 - In the area past the uniform.
Level 11 - Near the back of the lower deck.
Level 12 - Hidden in the area behind the Medical Scanner.
Level 13 - Can't miss it, hallway, next to the first room you see.
Level 14 - Right in front of the start!
Level 15 - Behind the door that was always locked before this mission (behind the Skedar w/Mauler).
Level 16 - Behind a Skedar to the right of the Callisto, well, generally.
Level 17 - Next to the Shield (only there in A/SA) at the end of dead end tunnel (head the WRONG way at the start).