For most achievements, you have to do the action after 2.0 went live (i.e. since yesterday).
See the blog for more details: http://blog.warlight.net/index.php/2013/07/coming-soon-achievements-and-trophies/
Also note that, unless otherwise specified, you have to do them in a ranked multi-player game. Practice games don't count, and neither do single player.
If this still doesn't explain why you're not seeing something, send the game link along with what achievement you think it should have unlocked to http://warlight.net/ReportBug