The Maw downloadable XBLA game(250G Achivements)
Register for a FREE(Silver membership) XBL account and get this at the end of your trial. Input code into normal account.

Tinker (Games For Windows Live- GFWL) (200G Achivemts)
Download the free games for windows LIVE client and get this game free for the PC. You can have achivements that cross over to the XBOX.
Doritos Crash Course(200G Achivements)
Download for free from the marketplace.

Harm's way(200G Achivements)
Download for free from the marketplace.

Hexic HD(200G Achivements)
Comes with all standard consoles(NOT the Slim) consoles; is on and off free in the marketplace.

Aegis Wing(200G Achivements)
Download for free from the american marketplace. Achivements only avalible if you transfer licenses.

That is it! Enjoy your free stuff, and thank me by being an active member of the clan