I just noticed this when I saw a strange “Achievement Unlocked” notification pop up on Reddit. What do you think of this? It seems like a retention tactic to me, like what Amino had with its streak leaderboards, and GameFAQs currently has with streak achievements for logging on ten days in a row and also for all days of a month.
Games, social media sites, online shops, they are all working on building the psychologically optimised perfect maze for their prey.