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.
Destroy all blocks on a level.
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.
Kill a scorpian. Fatality.
Finish the first level
Collect a laser powerup.