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