This topic has been pinned, so it's probably important
SEGA  [developer] Aug 1, 2014 @ 3:06am
New Update 01/08/2014
Hi all,

You may have noticed some new things crop up in our existing Dreamcast collection on Steam, such as achievements. Currently this content isn’t accessible but it’s part of an initiative from SEGA over the next few months which is going to improve the player experience for these titles. We don’t have an exact date for these improvements just yet but please bear with us, we’ll keep you posted with more information just as soon as we’re able to.

Thanks for your patience.