Here is a walkthrough to get all endings. Only read if you don't mind spoilers! Kotoko: All done, Ko-chan! Uh... Honey, you won’t need much clothes anyway once we arrived there. But you like my big gun, Ko-Chan~~ Queen Kotoko and Princess Hotaru, of co...

So there was an update 16 hours ago (what I assume was its inclusion in the Indie Gala Bundle). This update has broken some of the achievements for some players. Is there any way to contact the developer for them to look into this issue?

not popping.

Its still broken.

No matter how much I click on the first line, the achievement does not unlock.