How do you get the rest of the lettering?? I did all 29 levels but only got about 25 achievements

And this is top of the list. It's $5 and looks it. Decided to check Steam this weekend , see If I can get a decent quality game for a discount. Saw this and shook my head.

real talk

lol

Dev do you really have such a big problem with this? Achievements not working in atleast 3 of your games. Fix it please or delete them, how hard is that?