Here is the full list of all 46 Digimon Survive achievements.
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.
Unlocked all achievements.
Reached a fork in the story.
Entered the final battle.
Took the Truthful route.
Beat MegaSeadramon.
Beat Piedmon.
Saved Miyuki.
Beat Boltboutamon.
Beat Plutomon.
Beat the Master.
Beat Baihumon.
Beat Ebonwumon.
Beat Azulongmon.
Beat Zhuqiaomon.
Beat Fanglongmon Ruin Mode.
Completed the Moral route.
Completed the Wrathful route.
Completed the Harmonious route.
Completed Truthful route to the next generation.
Acquired 100 items while exploring.
Agumon reached Mega level.
Dracmon reached Mega level.
Labramon reached Mega level.
Falcomon reached Mega level.
Lopmon reached Mega level.
Kunemon reached Mega level.
Floramon reached Mega level.
Syakomon reached Mega level.
Garurumon reached Mega level.
Renamon reached Mega level.
Evolved to Omegamon.
Encountered all monsters.