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