Here is the full list of all 46 Digimon Survive achievements.
Unlocked all achievements.
Encountered all monsters.
Completed the Harmonious route.
Beat Boltboutamon.
Beat Plutomon.
Completed the Wrathful route.
Completed Truthful route to the next generation.
Beat Fanglongmon Ruin Mode.
Beat Zhuqiaomon.
Kunemon reached Mega level.
Labramon reached Mega level.
Beat Azulongmon.
Floramon reached Mega level.
Falcomon reached Mega level.
Dracmon reached Mega level.
Beat Ebonwumon.
Lopmon reached Mega level.
Beat Baihumon.
Syakomon reached Mega level.
Beat MegaSeadramon.
Took the Truthful route.
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.
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.
Agumon reached Champion level.
Acquired your first item while exploring.
Recruited a Free Monster.
Agumon reached Rookie level.
Embarked on your adventure.