https://starbounder.org/BugsBugs in Starbound look like little flying pixels. You'll find a few creatures that look like they might be bugs, like the snails, but they are actually considered critters. So far all the bugs I've found have been little flying sometimes colorful pixels. You'll need to first build a Bug Net at a Foraging Table. Then simply find any one type of bug, and use the Bug Net on them. There are 42 total, but you'll only need to catch one for this achievement. They will then be shoved into a magically appearing bottle for you to pick up, and this will pop.