Here is the full list of all 46 Digimon Survive achievements.
Unlocked all achievements.
Encountered all monsters.
Completed Truthful route to the next generation.
Beat Fanglongmon Ruin Mode.
Beat Zhuqiaomon.
Beat Azulongmon.
Lopmon reached Mega level.
Floramon reached Mega level.
Kunemon reached Mega level.
Labramon reached Mega level.
Beat Ebonwumon.
Dracmon reached Mega level.
Falcomon reached Mega level.
Syakomon reached Mega level.
Beat Baihumon.
Beat MegaSeadramon.
Acquired 100 items while exploring.
Took the Truthful route.
Beat the Master.
Completed the Moral route.
Saved Miyuki.
Evolved to Omegamon.
Garurumon reached Mega level.
Completed the Wrathful route.
Beat Plutomon.
Completed the Harmonious route.
Entered the final battle.
Beat Boltboutamon.
Renamon reached Mega level.
Agumon reached Mega level.
Reached a fork in the story.
Beat Piedmon.
Beat Wendigomon
Agumon reached Ultimate level.
Beat Monzaemon.
Beat Garurumon.
Beat Cyclonemon.
Beat Arukenimon.
Evolved a Free Monster.
Beat Fangmon.
Beat Dokugumon.
Acquired your first item while exploring.
Agumon reached Champion level.
Recruited a Free Monster.
Agumon reached Rookie level.
Embarked on your adventure.