Reach Sergeant (Level 10) in Multiplayer while playing online.

In Campaign, kill an enemy through a wall or obstruction.

Kill 5 Enemies in a Row with Headshots

Defeat 50 Enemies with Hand-to-Hand Combat

Defeat 20 Enemies with Hand-to-Hand Combat

Explore Photo Mode

Kill 75 Enemies in a Row Without Dying

Defeat 20 Enemies with Hand-to-Hand Combat

Finish the Game on Easy Without Changing the Difficulty

Kill an Enemy While Playing as an Alternate Character Costume Other Than Drake

Kill 30 Enemies with the MP40

Find 10 Treasures

Kill 100 Enemies with Headshots