Under Siege Forum

There are 15 Trophies that can be collected.

Bronze

Crafty
Create a map.

Boot Camp
Complete the tutorial.

Brothers in Arms
Win an online match with a friend.

Silver

Step Aside
Win 5 ranked matches in a row.

Lightning Offense
Win a ranked match in less than 5 minutes.

Gold

Chapter 1
Complete Chapter 1.

Chapter 2
Complete Chapter 2.

Chapter 3
Complete Chapter 3.

Chapter 4
Complete Chapter 4.

Chapter 5
Complete Chapter 5.

Survivalist
Complete a chapter without losing a single unit.

Hardcore
Complete the game in the Hard difficulty setting.

Platinum

Master Strategist
Gain all trophies.

2 Secret

http://www.ps3trophies.com/for…..-list.html