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