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.
Beat Ebonwumon.
Kunemon reached Mega level.
Lopmon reached Mega level.
Beat Baihumon.
Beat MegaSeadramon.
Took the Truthful route.
Completed the Harmonious route.
Beat Boltboutamon.
Completed the Wrathful route.
Beat Plutomon.
Acquired 100 items while exploring.
Completed the Moral route.
Beat the Master.
Entered the final battle.
Saved Miyuki.
Evolved to Omegamon.
Garurumon reached Mega level.
Renamon reached Mega level.
Falcomon reached Mega level.
Dracmon reached Mega level.
Floramon reached Mega level.
Labramon reached Mega level.
Syakomon 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.
Beat Fangmon.
Evolved a Free Monster.
Beat Dokugumon.
Agumon reached Champion level.
Acquired your first item while exploring.
Recruited a Free Monster.
Agumon reached Rookie level.
Embarked on your adventure.