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