Here is the full list of all 16 XenoFeud achievements.
Starting well.
You're getting better.
You know how to survive.
Aliens can't get rid of you.
Kill 1000 aliens.
Kill 100,000 aliens.
Destroy 500 asteroids.
Repair your drones.
Fire 1 million bullets.
You've reached the end.
Kill your first alien.
Kill your first alien boss.
Enhance for the first time.