Dynasty Warriors 7 Empires achievements

Be appointed Prefect for the first time.

Be appointed Marshal for the first time.

Swear a sworn sibling oath for the first time.

Become Ruler for the first time.

Get married for the first time.

Participate in a joint training exercise.

Complete one of the scenarios within Empire Mode.

Enter enemy territory alone and defeat an enemy officer.

Win a battle while retaining 90% or more of your troops.