Here is the full list of all 45 Digimon World: Next Order achievements.
Maxed out city's Prosperity
Cleared all extra dungeons
Defeated Armageddemon
Acquired over 1,000,000 bits
Cleared Chapter Four
Partner reached age 20
First Colosseum victory
Prosperity at level 100
Won 300 battles
First camp
Acquired over 100,000 bits
Cleared Chapter Three
Cleared Chapter Two
Prosperity at level 50
Inflicted 9,999 damage in one attack
First Digivolution to Mega
First king-sized foe defeated
Cleared Chapter One
Maximum value for DigiFriend
First Digivolution to Ultimate
All skills for Partner Digimon at 1,000
First time fleeing from a fight
First Digivolution to Champion
Maximum value for Bond
First fish caught
First Tamer level
Inflicted 1,000 damage in one attack
First Digivolution to Rookie
First food ingredient item picked up
First materials acquired
Prosperity at level 1
Finished a battle with no damage
First training
First Partner Digimon reborn as DigiEgg
Acquired all achievements
First training mistake
Raised 50 types of Digimon
First DNA Digivolution
Maxed out grades on all facilities as builder
Won all Colosseum competitions
Raised 100 types of Digimon
Completed DigiCards
Partner reborn as DigiEgg 20 times
Raised 200 types of Digimon
Maxed out Tamer level