Purchase all skills in one category.

Kill 75 enemies with the rifle.

Perform 15 finishers.

Force an enemy to drop dynamite that kills two people when exploding.

Kill 25 unaware enemies.

Perform 50 headshot kills in the single player campaign.

Collect 25% of all relics.

Find 25% of all documents.

Complete D-Day.

Corner Zakhaev's Son.

Complete 'All Ghillied Up' without alerting any enemies.

Find Al-Asad's safehouse.