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