Hello there! Thanks for playing my game, I'm so happy to hear that people enjoy it! <3.
First of all, I apologize for the error that keeps showing up, I will definitely take a look into it and fix it in the next update.
To get the achievements, you have to try to take every decision possible, because they lead to different dialogues and scene that let you get the achievement. Still, if you need help, you can read the advice in the "?" button in the achievements menu. Regarding to the "I Don't Want To Eat That But..." achievement, you can't get it yet, it's just a small preview of what will happen in the coming days.
Also, I'm glad you noticed the connection between the "first time" choice and the song :)
The game is full of references, I hope people notice all of them!