ToME: the Tales of Maj'Eyal

So, the thing is, I was forced to play offline without being able to log into my account. Problem is, I don't get the achievements in my account, despite being online now. Is there a way to flush them to my account?

the achievements on your computer, and account, compare and update each other every time you connect.
just log in, and it will be fine.

You might want to sit on the main menu for a minute or so to let it connect. Sometimes it stops trying if you click through to loading a character immediately.

Nope, didn't work.

Unfortunately you sometimes lose achievements. I had sporadic connection problems, and half of my winners ended up not getting registered as a result. I'd hoped that this had been fixed, but apparently not. Do your characters on the account match their online records?

Actually yes, they do. The characters have all achievements, but the ones made when offline are not in the achievement-collection on my profile.
So the problem seems to be that you don't get achievements while not logged in aka playing offline. You should be able to log in online, then play offline in the account. Hope they will think over this somewhen.