Here is the full list of all 20 History Legends of War: Patton (NA) achievements worth 1,000 gamerscore.
10 heroic victories achieved (Campaign Mode)
Third Army completed (Campaign Mode)
Game completed (Campaign Mode)
Fourth operation completed without casualties (Campaign Mode)
All types of units unlocked (Campaign Mode)
5 heroic victories achieved (Campaign Mode)
Third operation completed (Campaign Mode)
First aircraft recruited (Campaign Mode)
Second operation completed (Campaign Mode)
200 German units destroyed (Campaign Mode)
15 German soldiers killed with knife (Campaign Mode)
Max out any of Patton's Skills (Campaign Mode)
100 German units destroyed (Campaign Mode)
First operation completed (Campaign Mode)
50 German units destroyed (Campaign Mode)
First tank recruited (Campaign Mode)
First bazooka recruited (Campaign Mode)
First upgrade made (Campaign Mode)
First mission completed (Campaign Mode)
Tutorial completed