Here is the full list of all 11 Blackout!! achievements.
Look at the credits
Win a game playing as Alaric
Win a game playing as Danae
Construct a total of 30 defences
Sell a total of 5 defences
Perform a total of 10 defence upgrades
Get hurt by fall damage
Defeat a total of 5 enemies with one of Danae's meteors
Defeat a total of 3 enemies with one of Alaric's spins
Win a game without letting your core take any damage
Repair a total of 5 defences