The game only having about 40 achievements is kind of... Boring. While filling out the meta quests is fun and rewarding, it doesn't feel quite the same as getting steam achievements. In previous titles, it was an impressive feat to get every steam achievement and that should continue with 7, especially considering that they all already exist but aren't displayed on steam. Getting all achievements should be something to show off, not something you can fill out in 50 hours of gameplay with enough focus
(Also, as someone who doesn't focus much on meta quests this would actually make me want to do them and therefore spend more hours on your game haha)