I’ve updated the recent achievements image script to have another option. You can now choose the width of the image by adding width=<# of pixels> to the URL.

Like so:

[img]http://www.yourfirefly.com/wow/achievements.php?image&character=Slippir&realm=Mug'thol&region=us&faction=alliance&width=440[/img]

the above code produces the following…