Here is the full list of all 45 Digimon World: Next Order achievements.
Partner reborn as DigiEgg 20 times
Raised 100 types of Digimon
Maxed out Tamer level
Cleared all extra dungeons
First time fleeing from a fight
Maxed out city's Prosperity
Raised 50 types of Digimon
Acquired over 1,000,000 bits
Defeated Armageddemon
Cleared Chapter Four
Won 300 battles
Prosperity at level 100
Cleared Chapter Three
First training mistake
Cleared Chapter Two
Partner reached age 20
First Colosseum victory
Prosperity at level 50
Acquired over 100,000 bits
First camp
Cleared Chapter One
Inflicted 9,999 damage in one attack
First Digivolution to Mega
First fish caught
All skills for Partner Digimon at 1,000
Maximum value for DigiFriend
First Digivolution to Ultimate
First king-sized foe defeated
Maximum value for Bond
Inflicted 1,000 damage in one attack
First Digivolution to Champion
First Tamer level
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
First DNA Digivolution
Maxed out grades on all facilities as builder
Won all Colosseum competitions
Completed DigiCards
Raised 200 types of Digimon