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