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