Here is the full list of all 48 Dynasty Warriors 8: Empires achievements.
Obtain virtue of "Saint."
Stop a Large Scale Stratagem being prepared by the enemy.
Be appointed as a Marshal for the first time.
Swear a sworn sibling oath for the first time.
Receive a weapon or item as a gift for the first time.
Build a facility for the first time.
Complete your first mission.
Fight and win a stage in spring, summer, fall and winter.
Complete a Strategy Objective for the first time.
Obtain 20 officers in your own Kingdom.
Complete four Battle Objectives in a single battle.
Win a battle with more than 90% of your total forces remaining.
Accomplish all of the achievements in the game.
Clear any scenario on the "Chaos" difficulty.
Complete all lifestyles.
Achieve all titles.
Obtain at least 100 weapons.
Obtain at least 30 items.
Use any custom character to defeat all of the famous officers.
Defeat more than 10,000 enemies using just Stratagems.
Execute all Strategy Commands at least once.
Have a total of at least 5 children.
Make all famous officers into your subordinate officers.
View all of the events that can be watched in the Gallery.
Have a child for the first time.
View any of the endings using a custom character.
Profess your love for someone or have someone confess their love for you for the first time.
Get married for the first time.
Succeed your superior's position for the first time.
Became a Ruler for the first time.
Get recruited as a Marshal or Strategist from being a Free Officer.
Rise in rebellion and become Ruler.
Raise the banner of your own Kingdom for the first time.
Create a Kingdom comprised entirely of your sworn siblings, spouses and children.
Perform a betrayal for the first time.
Have a subordinate officer abandon you for the first time.
Fight your way into enemy territory alone and defeat an officer.
Use a Stratagem to change the weather.
In Edit Mode, create at least one officer, banner, warhorse and soldier.
Use at least 100 Stratagems.
Be appointed as a Strategist for the first time.
Take part in "Battle of Chibi - Allied Forces" & have Zhuge Liang's "Southeast Wind" strategy work.
Capture 10 or more bases during a single battle.
Obtain virtue of "Pure Evil."
Complete a Quest and deepen your friendship with your Ruler.
Have at least three officers declare their love for you in a single lifetime.
Build at least six of the same facility.
Win a battle with significantly less allied forces than enemy ones.