The Siege Expansion Pack Add-on for Uncharted 2: Among Thieves has 11 trophies - 10 bronze and 1 silver.
Complete all three Co-op Objective maps on Crushing
Get 20 Shut 'Em Down Medals
Get 5 Put 'Em Down Medals
Finish Wave 10 in one Siege Game
Get 50 Defender Medals
Get 10 Protectorate Medals
Get 100 Tricky Medals
Get 50 Retaliation Medals
Get 50 Afterlife Medals
Get 15 Triple Threat Medals
Get 10 First! Medals