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

Master Of Shadows (10 points): Complete Mission "The Lost - Valley".
Demolition (10 points): Complete Mission "The Lost - Fuel Storage".
Infiltration (10 points): Complete Mission "Death Of The Butcher - Cathedral".
Liberator (10 points): Complete Mission "Death Of The Butcher - Crypt".
In The Lion's Den (10 points): Complete Mission "Leave A Light On - Docks".
Firebug (10 points): Complete Mission "Leave A Light On - Storage".
Down-And-Dirty (10 points): Complete Mission "The Third Man - Sewers".
Witness (10 points): Complete Mission "The Third Man - Ghetto".
Delivery Service (10 points): Complete Mission "The Third Man - Prison".
Assault (10 points): Complete Mission "Le Boeuf".
Phoenix (10 points): Complete Mission "Fade To Grey - Hospital".
Ace (30 points): Complete Campaign in Normal Difficulty.
Legend (50 points): Complete Campaign in Agent Difficulty.
Close Combat Expert (20 points): Execute a silent advance through "The Lost - Valley".
Wine Connoisseur (20 points): Take something along in "The Lost - Fuel Storage" that pleases your palate.
Art Connoisseur (20 points): Secure a precious art piece from the Nazis in "Death Of The Butcher - Crypt".
Avenger (20 points): Save many brave seamen by eliminating the sleeping threat in "Leave A Light On - Docks".
Miss Merciless (20 points): Remove the occupiers in "The Third Man - Ghetto".
Killjoy (20 points): Cut short the observer's sadistic pleasure in "The Third Man - Prison".
Informant (20 points): Secure confidential document in "Le Boeuf".
Miss Know-It-All (50 points): Accomplish all secret objectives.
Gold Lover (10 points): Secure precious collectible in "Death Of The Butcher - Crypt".
Golden Bullet (10 points): Secure precious collectible in "Le Boeuf".
General (10 points): Secure precious collectible in "Death Of The Butcher - Cathedral".
Diplomat (10 points): Secure precious collectible in "The Third Man - Prison".
Admiral (10 points): Secure precious collectible in "Leave A Light On - Storage".
Attentiveness (10 points): Secure 15 collectibles during a campaign.
Sharp Senses (30 points): Secure 40 collectibles during a campaign.
Eagle Eye (50 points): Secure all collectibles during a campaign.
Disciple (10 points): Earn first skill point.
Master (30 points): Earn 10 skill points during a campaign.
Grand Master (50 points): Earn 15 skill points during a campaign.
Curiosity (30 points): Find all letters during a campaign.
Assertiveness (10 points): Kill 50 enemies during a campaign.
Bad Temper (30 points): Kill 150 enemies during a campaign.
Relentlessness (50 points): Kill 300 enemies during a campaign.
Rogue (10 points): Kill 50 enemies silently during a campaign.
Slayer (30 points): Kill 100 enemies silently during a campaign.
Assassin (50 points): Kill 200 enemies silently during a campaign.
Gotta Light? (20 points): Kill 10 enemies with the flare gun during a campaign.
Blast 'Em (20 points): Trigger 5 grenades during a campaign.
Detox (30 points): Complete a mission without using morphine although you have some.
Ninja (30 points): Complete a mission firing a gun only when killing silently.
Phantom (30 points): Complete a missions without getting identified.
Blitzkrieg (50 points): Complete the campaign in less than 5 hours.