Here is the full list of all 11 Bad Caterpillar achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Reach Level 30.
Reach Level 20.
Swat those flying bugs.
Destroy caterpillar with one bomb.
Complete ten levels without dieing.
Reach Level 10.
Rolly Polly isn't going to kill itself.
Destroy all blocks on a level.
Collect a laser powerup.
Kill a scorpian. Fatality.
Finish the first level