As the title of the guide stated. Are you having an issue with achievements not popping on steam?

Option number one.

A common issue was sometime at some point the achievements turn off.

Check your menu.

Your menu should look like this. The achievement button in the top right it's the middle selection. If it's not the same colour as the photo click on it and that should fix it.

If it was already the right colour then click it off, play a level then put it back on.

Or click it off, close the game and make sure it's completely close via Task manager then reopen the game and make sure it's on for achievements.

Another option

Completely close steam, check task manager to make sure it's closed. At this point you could try restarting your computer first, but open up steam and try the game again.

Delete the game and reinstall it. Sorry kinda last option other than giving up completely.

If you got other ideas to fix this issue please let me know ill happily credit you and add it to the guide.