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