Here is the full list of all 26 In My Defense achievements.
An evacuation ship escaped to freedom.
Player used the teleporter
Tank killed by falling saucer
Killed by a Terror Stalk
Wingman survives for 5 minutes
Have 6 Launchers at one time
Run out of bombs
Use 1000 Powerups
Kill 10 enemies at once with the sonic bomb
Win game, beating boss on level 31
Kill 50,000 enemies
Beat level 6
Beat level 11
Beat level 16
Beat level 21
Beat level 26
Finish level 5 without incurring any deaths on that level
Finish level 9 without incurring any deaths on that level.
At the end of level 4, have no damage to your base.
Survive being stunned by a hacker.
In the basement, kill at least 10 enemies with a gas explosion.
In the basement, kill an AI bot that has been turned by a hacker.
Survive endless mode for 15 minutes.
Knock a Steaky Surfer off its weapon.
500 killing streak without dying.