The Fort Co-op Add-on for Uncharted 3: Drake's Deception has 10 trophies - 7 bronze and 3 silver.
Complete the Artifact Treasure Set
Get 100 Gate Keeper Medals
Get 50 Gunslinger Medals
Get 10 Detonator Medals while on Hard Difficulty
Win 50 matches of Team Objective
Get 25 Triple Threat Medals
Earn 3000 Objective Points
Get 50 Strike Three Medals
Get 50 Three Kickback King Medals
Get 3 Hang In There Medals while on Hard Difficulty