Not every achievement is about games. Sending your first message, following someone for the first time, reaching a good number of followers, sending a handful of gifts, or watching a few movies in the Watch section can each unlock their own achievement. There are also lighthearted ones tied to unusual moments — like playing at an odd hour, finishing something impressively fast, or even losing a certain number of games in a row.
These are meant to reward being an active, well-rounded member of Chillverse rather than just a top scorer, so don't worry if you're not chasing every game's leaderboard — plenty of achievements are earned just by being social and consistent.