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