Changed your hair style or beard.

Obtained first divine item.

Confused an enemy for the first time.

Shoot down an enemy helicopter with an RPG in the single player campaign.

Operate an AC-130 gun ship.

Kill at least 3 rappelling enemies in a single rope.

Protect 'War Pig', the Abrams tank.

Complete a quest tutorial.

Save Pvt. Roycewicz on the stairs.

Kill an enemy while blinded by a flashbang in the single player campaign.

Complete 'Blackout' on Veteran difficulty.

Complete 'Crew Expendable' on Veteran difficulty.

Kill 4 enemies in a row with headshots in the single player campaign.