Complete all trials on Moderate (difficulty) in Multiplayer

Make 10 enemies drop their grenades

Listen to all optional conversations in game

Find the Strange Relics

Defeat 4 enemies with the same explosion (all explosive items and weapons apply)

Find all Journal Entries

Find 50 treasures

Use every weapon in the game

Defeat enemies with a stealth attack, melee attack, headshot, and explosives, in that order, in 15 seconds

Knock over all rock cairns in Madagascar

Find a Journal Entry

Defeat 50 enemies from-the-hip or blind-firing

Defeat 100 enemies in a row without dying in combat