Here is the full list of all 51 Grand Ages: Medieval trophies - there are 38 bronze, 10 silver, 2 gold and 1 platinum.
12 towns founded
You have built 10 defense towers.
You have plundered 50 traders.
Campaign: You have completed the campaign
Campaign: Barnas Goes Nuts
5 towns taken over by military means
You have declared war.
You have eliminated a competitor.
You have 50 units of military troops under your command
6 towns taken over
You have recruited 100 troops in the game.
Recruited a troop of knights
5 towns taken over by diplomatic means
4 towns taken over
You have amassed 50,000,000 gold.
8 towns founded
2 towns taken over
A town has reached 15,000 inhabitants
You have built 500 businesses.
You have unlocked an entire tree in the development diagram.
You have unlocked all commodities.
A town has reached 8,000 inhabitants
You have built 200 businesses.
You have amassed 5,000,000 gold.
You have traded 1,000,000 barrels of commodities.
You have built 10,000 km of roads.
You have built your first ship
4 towns founded
You have discovered 50 Adventure Sites.
A town has reached 3,000 inhabitants
You have plundered 10 traders.
You have built 1,000 km of roads.
You have built 50 businesses.
You have slain 5 predators.
Campaign: In bed with Eudokia
One of your towns or cities has achieved the maximum level of prosperity.
You have traded 10,000 barrels of commodities.
You have discovered 10 Adventure Sites.
You have maximized the experience of a military troop.
You have entered into your first trade agreement.
All trophies received
Out of all your competitors, you founded the most towns upon reaching the rank of "Emperor".
Out of all your competitors, you had the largest town or city upon reaching the rank of "Emperor".
Out of all your competitors, you built the most businesses upon reaching the rank of "Emperor".
You have celebrated your first festival.
You have destroyed 5 bandit camps.
Finished first multiplayer game
Won first multiplayer game
Handed goods over to a fellow player
Snuffed out a fellow player's troop
Took over a fellow player's town