Here is the full list of all 7 The Masters: Survival achievements.
Cleared the Story mode and unlocked Future Tana.
Found all journal entries in Story Mode.
Destroyed 50 Shadow Dwellers in Survival Mode.
Destroyed 150 Shadow Dwellers in Survival Mode.
Destroyed 300 Shadow Dwellers in Survival Mode and unlocked the Secret Story Level.
Destroyed 500 Shadow Dwellers in Survival Mode.
You've discovered the secret unfinished room.