Try bringing up game-related phrases/remarks while texting every now and then, similar to how he said "Achievement Unlocked".
If he catches on to them that means he is pretty good with his games and will know you are too, if he doesn't catch them then no harm done since he won't know it is game related.
I spent my spare today on Graal showing my in real life friends what it was about they didn't really enjoy all too much and basically bashed on me for still playing it even after all these years (although, at the time I was dressed up as a female jokingly hooking up with noobies so that probably gave a bad image)
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I think this is a good idea, try to bring up game references subtly or bring gaming into conversations and see where it takes you. It could be possible that he is shy about gaming as well.