Here is the full list of all 58 Last Day of Rome achievements.
Win for Franks
Win for Alemans
Win for Lugia
Win for Ebdany
Win for the Gepids
Win for Ants
Win for Wends
Win for Sklavins
Capture regions
Deal HP Damage
Get population
Sell resources for gold
Recruitment Growth
Discover science
Discover cavalery types
Hire several Generals