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

Tourist (15 points): Collect all monument postcards.
Hell on Wheels (10 points): Complete and win all freeplay races.
Weapon Master (35 points): Purchase all weapons available in the shops.
Solid Gold (50 points): Complete all gold level perks.
Saint Honoré (15 points): Spend 75,000 contraband.
Demolition Derby (15 points): Destroy 50 vehicles.
Top o' the World (15 points): Climb to the top of the Eiffel Tower.
Liberator of France (110 points): Inspire the people of France.
Silent Death (10 points): Stealth kill 50 or more Nazis.
Northern Command (10 points): Inspire the people of Paris Area 1.
Western Command (10 points): Inspire the people of Paris Area 2.
Southern Command (10 points): Inspire the people of Paris Area 3.
Chain Smoker (5 points): Spend a lot of time idling around doing nothing.
Casanova (10 points): Kiss 50 women.
Silver Streak (10 points): Obtain your first silver perk.
Gold Medalist (20 points): Obtain your first gold perk.
First Blood (5 points): Complete your first ambient freeplay event.
Commando (10 points): Complete each type of ambient freeplay.
Wrecking Crew (15 points): Complete 333 ambient freeplay in Paris Area 1.
Unnatural Disaster (15 points): Complete 212 ambient freeplay in Paris Area 2.
Walking WMD (15 points): Complete 239 ambient freeplay in Paris Area 3.
Fatherland Fighter (15 points): Complete 53 ambient freeplay in Saarbrucken.
Coast Guard (15 points): Complete 76 ambient freeplay in Le Havre.
Guerilla Warfare (15 points): Complete 425 ambient freeplay in the countryside.
Pigeon Parfait (5 points): Find and play 'Bird Blast.'
No Witnesses (10 points): Complete a mission without raising alarm.
Master of Disguise (15 points): Complete a story mission with disguise intact.
Trick or Treat (5 points): Stealth kill a Nazi General while disguised.
High Diver (15 points): Jump from the Eiffel Tower and survive.
Not On My Watch (15 points): Stop the Nazis from executing 40 civilians.

Additionally, there are fifteen secret achievements:

Secret achievement (10 points): Unknown.
Secret achievement (30 points): Unknown.
Secret achievement (30 points): Unknown.
Secret achievement (30 points): Unknown.
Secret achievement (30 points): Unknown.
Secret achievement (40 points): Unknown.
Secret achievement (40 points): Unknown.
Secret achievement (50 points): Unknown.
Secret achievement (100 points): Unknown.
Secret achievement (10 points): Unknown.
Secret achievement (25 points): Unknown.
Secret achievement (10 points): Unknown.
Secret achievement (10 points): Unknown.
Secret achievement (40 points): Unknown.
Secret achievement (25 points): Unknown.