Purchase all skills in one category.

Kill FeeFee the crab.

Kill a skeleton with an arrow from more than 50 meters.

Kill 75 enemies with the rifle.

Kill 25 unaware enemies.

Survive 10 explosions in multiplayer.

Kill 10 multiplayer enemies using your melee attack.

Revive a teammate in a multiplayer match.

In multiplayer, be the only player on your team that isn't dead or downed.

Shoot a bundle of dynamite out of the air.

Kill 35 enemies with the pistol.

Perform 50 headshot kills in the single player campaign.