Accomplish the indicated achievement to get the corresponding number of Gamerscore points:

Secret Agent (50 points): Complete all levels on "Agent" difficulty or higher.
007 (50 points): Complete all levels on a 'Classic' difficulty.
Goldfinger (15 points): Complete the 'Goldfinger' mission.
O.H.M.S.S. (15 points): Complete the 'O.H.M.S.S.' mission.
Licence To Kill (15 points): Complete the 'License To Kill' mission.
Die Another Day (15 points): Complete the 'Die Another Day' mission.
Moonraker (15 points): Complete the 'Moonraker' mission.
People Power (10 points): Campaign: Collect 30% of all character bio intel.
Making it Personal (10 points): Campaign: Collect 100% of all character bio intel.
Web of Intrigue (10 points): Campaign: Collect 30% of all organization intel.
Clandestine (10 points): Campaign: Collect 100% of all organization intel.
Happy Snapper (10 points): Campaign: Take a photograph of the crocodile.
Scream if you want to go faster (10 points): Campaign: Give someone an exciting training experience.
Vodka martini, plenty of ice... (20 points): Get 100% collection rating for 'Die Another Day'.
I expect you to die (20 points): Get 100% collection rating for 'Goldfinger'.
Never happened to the other guy (20 points): Get 100% collection rating for 'O.H.M.S.S.'
You prepare for the unexpected (20 points): Get 100% collection rating for 'License To Kill'.
Around the world one more time (20 points): Get 100% collection rating for 'Moonraker'.
Boys with Toys (10 points): Campaign: Buy all of the attachments for one weapon class.
Very novel Q (10 points): Campaign: Upgrade a gadget to its highest level.
Standards of Physical Perfection (30 points): Campaign: Acquire all of the MI6 training modules.
Everything or Nothing (5 points): Complete all of the trials on any one level.
Extended Operative (20 points): Complete eight of the 'Operative' level trials.
More Than an Agent (25 points): Complete six of the 'Agent' level trials.
Above and Beyond a 00 (30 points): Complete three of the '007' level trials.
Spend the money quickly Mr. Bond (20 points): Campaign: Be awarded a total of 10,000 XP.
Distracting (10 points): Distract an enemy.
Positively shocking! (12 points): Take out two enemies with one shock dart.
Master at Arms (20 points): Make an elimination with every weapon class.
Challenger (20 points): Earn a 1 star rating in each mission of the Challenges mode.
All That Glitters (10 points): Earn a 3 star rating in any mission of the Challenges mode.
Shooting Star (20 points): Get 30% of all available stars in the Challenges mode.
Star Struck (40 points): Get 60% of all available stars in the Challenges mode.
Fascination with all things gold (60 points): Get 100% of all available stars in the Challenges mode.
Unlocked and Loaded (5 points): Public Match: Reach level 6 (Midshipman).
00 Agent (30 points): Public Match: Reach level 50 (00 Agent Grade 0).
A Farewell to Arms (50 points): Multiplayer: Enter 00 Specialization.
Laser Eraser (15 points): Public Match: Win a match using only laser-based weapons.
Midas Touch (15 points): Public Match: Win a match on Main Vault, Smelting Room and Loading Bay.
Danger! High Voltage (10 points): Public Match: Get 25 electrocution kills as Zao or Gustav Graves.
Counter-Sniper (25 points): Public Match: Kill 50 players while they are aiming down the scope of a sniper rifle.
Return to Sender (35 points): Public Match: In Bomb Defuse disarm the bomb and plant it at enemy base without getting killed.
Shaken, but not Stirred (10 points): Public Match: Survive 50 explosions while using Reactive Armor.
Disarmed and Dangerous (20 points): Public Match: In Escalation demote an enemy who is armed with the RPG.
Hold the Line (30 points): Public Match: Win a Data Miner match without being killed.
All the Time in the World (40 points): Public Match: Play for more than 24 hours.

Additionally, there are four secret achievements:

Signature (7 points): Campaign: Reach level three weapon proficiency with the P99.
With or Without Q (16 points): Reach Grave’s plane without using any in-car gadgets.
One small step for a man (0 points): Experience zero-g.
Omega Virus (15 points): Public Match: Kill an enemy who has completed the campaign or who already has this achievement.