Entomologist Achievement in I Dig It
Collect 30 small ants and 10 large ants from the Amazonian expedition.
How to unlock Entomologist
You need to collect 30 small ants and 10 big ants from the Amazon level. This involves nuking them with the bug bomb which you buy at the consumables store, collecting the dead ant and returning it to base for cash. The Amazon expedition requires you to only collect 7 ants in total, so a few quick play runs can help fulfill requirements to earn this achievement.