Kill 75 enemies with the rifle.

Kill 25 unaware enemies.

Shoot 10 enemies off zip lines.

Shoot a bundle of dynamite out of the air.

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

Kill 35 enemies with the pistol.

Collect 25% of all relics.

Find 25% of all documents.

Kill and loot 10 flying animals (crows and gulls).

Complete one challenge.

Buy every upgrade and character in multiplayer.

Kill 2 multiplayer enemies with a single explosive.