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