Knife an enemy without him ever knowing you were there in Single Player or Special Ops.

Finish the game in Easy Mode

Kill 30 enemies with the Dragon Sniper

Find 25 treasures

Kill 30 enemies with the MP40

Find 20 treasures

Find 15 treasures

Kill five enemies in a row with headshots

Find 10 treasures

Kill 30 enemies with headshots

Kill 10 enemies with headshots

Find one treasure

Earn at least 1 star in 11 different Special Op missions.