This week's deal sees Capcom's co-op survival adventure Resident Evil 5 get a 50% discount. As this is a LIVE enabled game when downloaded, it does carry achievements.

Resident Evil 5 (PC) - $29.99 / £19.99 $14.99 / £9.99
Somewhere in Africa, innocent villagers are transforming into ruthless abominations. Chris Redfield and his new partner, Sheva Alomar, must stop whatever is causing the disturbing turn of events. Now featuring online co-op, players can experience the next generation of fear together as terror moves out of the shadows and into the light of day.
Be aware though that the title does use the DRM function:

Digital Rights Management Disclosure. This software uses digital rights management software (“DRM”). DRM may limit the number of times you are permitted to install this software on a computer and/or the number of computers to which you may install the software. To function properly, DRM downloads certain data and files to your computer, which may or may not be uninstalled when you uninstall the software.
The game can be downloaded from here.
Rebecca Smith
Written by Rebecca Smith
Rebecca is the Newshound Manager at TrueGaming Network. She has been contributing articles since 2010, especially those that involve intimidatingly long lists. When not writing news, she works in an independent game shop so that she can spend all day talking about games too. She'll occasionally go outside.