-Estimated Trophy Difficulty: 4/10
-Offline: 14 (7 , 7)
-Approximate Amount Of Time To 100%: 15+ Hours
-Minimum Number Of Playthroughs Needed: 1
-Number Of Missable Trophies: 0
-Glitched Trophies: 0
-Does Difficulty Affect Trophies?: No
-Do Cheat Codes Disable Trophies?: None available
-Hardware required?: Second controller for local co-op
Step 1: Play the campaign
Play level 1-14 at any difficulty. Over this course you will unlock all abilities, all vehicles and the SP and co-op missions. At the end of this step you should have the following trophies: Earth Saviour, This stuff is good, Collector, First Blood and probably a few more.
Step 2: Complete the Baghdad and Tokyo missions
In these missions you have to survive several waves of enemies without any checkpoints. Once you lose all units or miss any time limit, you'll have to start that mission again from the beginning. At the end of this step you should have the following trophies: Mayhem Unleashed, A Bridge Too Far and Mayhem Rearmed.
Step 3: Play the co-op campaigns
Grab yourself a second player and complete both co-op campaigns locally, which are similar to Baghdad Mayhem and Tokyo Raid. This is unlikely to be doable alone with two controllers, as the Tokyo mission can get a bit hectic at the end, even for two players. At the end of this step you should have the following trophies: Twin Commander and Help me out here!
Step 3: Grind tower kills and cleanup
Replay campaign levels or missions until you get Avenger. Get the remaining trophies, if any.
[PS3T Would Like to Thank dcdfan for this Roadmap]