Kill 35 enemies with the pistol.

Purchase all skills in one category.

Kill 75 enemies with the rifle.

Collect 5000 pieces of salvage.

Complete Chapter 2 in Chris' campaign.

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

Kill 50 enemies with the bow.

Perform 50 headshot kills in the single player campaign.

Find 25% of all documents.

Rescue Oliver from the pirates.

Craft a special syringe.

Complete the Rakyat initiation.

Help or rescue your partner ten times.