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 caterpillar with one bomb.
Swat those flying bugs.
Complete ten levels without dieing.
Reach Level 10.
Collect a laser powerup.
Rolly Polly isn't going to kill itself.
Kill a scorpian. Fatality.
Finish the first level
Destroy all blocks on a level.