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For this achievement, you’ll have to release Monsties into the wild through Habitat Restoration at least 30 times.

To do this, you must use the Habitat Restoration option from within your camp and select Monsties to release into the wild. When you select your Monsties and choose to release, a small cutscene will play, and your Monsties will go off into the wild - they grow up so fast!

A couple of notes: you don't have to increase the Ecosystem Rank of the monster. I was at S for everything in Sunpetal Plains, and my Lonely Gemstone medal count still increased when releasing corresponding Monsties into the wild.

However, my count only increased by 1 despite releasing 5 Monsties at once, so this is an “each session” rather than “each Monstie” kind of deal. Release them one by one for efficient progress, though you'll no doubt get this naturally by playing the game and increasing Ecosystem Ranks across the continent.

Once you’ve released Monsties into the wild through Habitat Restoration at least 30 (individual) times, you’ll have your achievement!

Like many of these achievements, you can check your progress in your Ranger Records by pausing the game, navigating to “Ranger Files” (one tab to the right), and then selecting the Ranger Records dossier (the red one on the right). The Lonely Gemstone medal is the first beige medal, and is the first medal on the fifth row.