Here is the full list of all 34 Eiyuu Senki - The World Conquest trophies - there are 22 bronze, 5 silver, 6 gold and 1 platinum.
Watched the True Ending
Sided with all characters.
Obtained more than 1,000,000 gold
Conquered Uruk
Conquered Babylonia
Defeated the Illuminati and brought peace to the world...?
Conquered Britannia
Conquered the Dark Realm
Sasaki Kojirou sided with the Zipang Army
Conquered the EU
Conquered Russia
Conquered Southern America in the New World
Conquered Egypt
Conquered Macedonia
Conquered Vinland
Obtained more than 500,000 gold
Conquered Northern America in the New World
Didn't use money to buy USA
Conquered Southern Hawaii
Conquered Australia
Conquered the South Sea Colonies
Obtained more than 100,000 gold
Unified East Asia
Conquered India
Won a battle with only the protagonist fighting.
Conquered Mongolia
Won a battle without anyone getting any damage
Conquered Taika Empire
Unified Zipang
Won a battle that the protagonist joined, without him attacking even once.
The Protagonist joined the Zipang army.
Won the first battle.
Obtained all trophies.
Emerged victorious from Shambhala