Beat the game on "Do or die!" difficulty or higher

Beat the game on "Bring 'em on!" difficulty or higher

Upgrade a Contraption

Kill Hitler during the Aerostat Audition

Prestige a Division in Multiplayer when playing online.

Request Aiello to toss you signal smoke and call in mortar strikes 10 times.

Reach the sniper perch without being detected in Ambush.

Complete Hill 493.

Complete Collateral Damage.

Complete Liberation.

Sneak through the courtyard undetected in Liberation.

Complete S.O.E.

Complete Operation Cobra.