Steam Achievements
 

Literally the only negative I've found from the change to Steam is that the achievements pop up regardless of whether you have 'hide results' set on/off

As a result, when you get an achievement you know something about the game before you watch in on Solevision - for example I know I put 50 points on one team when I got the 'Eat A Fiftyburger' award, but more annoyingly I realised I lost the Bowl game when I didn't get an achievement pop on simming the week, and will know when I win my first Steam Championship because the achievement will pop up, similarly (hopefully) the fifth, etc...

Only a minor quibble, but is there a way in which the achievements can be deferred until the game has been watched on Solevision (I imagine this is very difficult/impossible?) or is there a Steam setting that might achieve this?

I think you could try disabling the in-game overlay. Right click the game, under properties, uncheck "Enable Steam Overlay In Game."

I don't know if that will do the trick, but it might. I hate the Steam Overlay.

Cheers - have unchecked it and will see how it goes.