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