Kill at least 10 enemies with one Predator Missile.

Infiltrate the snowy mountain side base.

Kill 2 enemies with a single bullet.

Qualify from your first round

Equip your first cosmetic item

Bump into 3 people while rolling on the ground before getting up

Kill 500 zombies

Break 20 Panes of Glass.

Land a 50,000+ point combo.

Have 20 enemies killed by propelling airvents in the 'Secret Base' level

Defeat the Tank boss

Kill a German soldier by dropping the churchbell on top of him in the 'Killing Fields' level

Kill 200 German soldiers