Here is the full list of all 11 Voidspire Tactics achievements.
Defeat 30 arachnids.
Destroy 5 Antiair.
Recover 4 Aerstone.
Discover an item by digging with a Shovel.
Learn all abilities of a single class.
Create something using a Crafting Kit.
Equip a primary class, secondary class, and 3 passives.
Unlock all 17 classes.
Complete 50% of the Journal.
Repair a damaged vehicle.
Beat the game on any difficulty setting.