Successfully complete the Bad Diplomacy level with a "Gold" rank.

Get 100000 points for level 8

  

Successfully complete the Poseidon level with a "Gold" rank.

On the level Bad Diplomacy Go up to the blue floor lasers and put on
  the q specs. You'll see a tiny door. Open it and use q laser on the
  wires to disable them.

  

Successfully complete the Evil Summit level with a "Platinum" rank and all 007 icons.

Get 130000 points and all 007 medallions for level 11
  

Successfully complete the Trouble In Paradise level with a "Gold" rank. To do this easily,
get as much accuracy as you can, take as less hits as you can, and do all the Bond moves
(shooting barrels to explode, shooting vital enemy characters and find secret areas).

When you fight Bloch,the first shot he fires is at the catwalk above.
  The rocket makes it fall(but it's still hanging by 4 wires). You keep
  shooting him until he goes to the 3rd level of the catwalks on the
  sides. He'll go through the hatch. Refill your Q-Jet and use it to get
  on the catwalk that he blew up. Go to the top of it until you reach
  the 3rd level railing. Turn arround so you can see the hatch that
  opened,then use your Q-Claw on the "grate" to pull yourself
  up.

    When you get through just walk foward. You will pick up a
  MRL-22 (Rocket Launcher),shoot him with it and a cutscene will appear
  and the game will have been BEATEN!!!!

     P.S.It's eayser than it sounds.

In Level 5 after you go down the elevator and your in the room where
  you have to use your Q-Decrptor on the 3 "Data Ports" that
  are on the walls well when you first walk in the room go straight and
  you should see a keycard slot well, at the starting of the level there's
  there doors and the one in the middle contains the keycard (its on the
  book shelf to your right).  So when you have to use your Q-Decrytor
  be sure to swipe the keycard and the alarms won't go off!

      

Get 100000 points for level 7

  

Ok, tired of getting only 3 chances to beat a level? Well once it says
  "mission failed" on the screen, just pause and select
  "restart mission" so you'll do the level over but, you'll
  still have your 2 lives.

  

Get 110000 points for level 9

  

Get 70000 points and all gold medallions for level 3

  

When you play multiplayer and go on town make sure you activate Q-claw
  and Q-jet. When you are playing, boost (jump first it makes you go
  higher) up on to the building closest to the cathedral. Get out your
  Q-claw out and Q-claw over to a balcony. Once inside you can sniper
  rifle people and duck to dodge their fire. Try and make sure you don't
  have the rocket launcher on because your a sitting duck and can be
  easily killed. Also if you are using a survival tactic you can boost
  from building to building, this works well on someone if they're not
  very good with the Q-jet.

  

Beat level 2 with 50,000 or more points