What invalidates an achievement?

[zlamaj]

With the new hot fix getting out of beta, I thought I'd ask for a definitive answer to this question. Luckily I hadn't had the bad luck of an achievement run get invalidated by a DLC, hotfix, beta patch, etc... but again, I don't know the rules to this.

Does the checksum really matter? Does the rule change depending on the patch type?


Thanks in advance

 

[Xara]

It has to be started after the patch that adds it, and the save file needs to not be irrevocably broken by that patch.

If you started a WC game in 1.7, for example, it should still be viable now.
You could not, however, attempt the Silk Road achievement unless it was a 1.8 game.

hotfix "shouldn't" affect that

 

[zlamaj]

Brilliant. Thanks very much