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.
It’s also just part of a wider internet trend I think. More and more games and social media have them. Developers are getting better and better at hacking people’s attention and reward pathways. For Duolingo I think it’s fun, because learning a language is a fun and productive thing to do anyways (and despite the hate it has really worked well for me) but for games and things like social media or whatever I just find it annoying.
Games, social media sites, online shops, they are all working on building the psychologically optimised perfect maze for their prey.