Here is the full list of all 20 Field of Glory: Empires achievements.
Build the Colossus, a tier III Commerce building
As Skythia, own 3 Nomad herds buildings.
As a client-state, break your treaty with your Protector
Win the grand campaign
Build the Great Lighthouse, a tier III Commerce building.
Build the Coliseum, a tier III Culture building.
Accumulate 10.000 Money
Win a short scenario (less than fifty turns long)
Own 150 units (soldiers or ships)
Trigger a Golden Age
Build your first Tier III building (any category)
Manage to gain five progress tokens.
Be in 8 or more wars at once
Become a decadent nation...
Make peace with someone
Win a siege against a walled city (by assault or surrender)
Raise a provincial unit
Create your first province
Win a battle with any nation
Play a battle in Field of Glory II and win it.