Here is the full list of all 12 Defense Technica achievements.
Unlock all towers.
Unlock all stages.
Check information on all enemies.
Sell more than 10 towers in one stage.
Save more than 5000 resources when clearing a stage.
Destroy more than 30 enemy units in 5 seconds.
Let 5 towers get destroyed by enemies in one stage.
Clear a stage with less than 5% Core HP remaining.
Clear a stage by building all types and all levels of towers.
Make an enemy's path longer than 250 meters by blocking with towers.
Get more than 150,000 points when clearing a stage.
Clear all stages with 100% Core HP.