The achievements were made by a site trolling for hits. There is absolutely nothing that would make them even remotely real.
However, the shirt is not only an actual shirt, but it was worn by a valve employee and spotted by a developer of Monday Night Combat, who proceeded to post it on his twitter. This was posted last Friday, and Valve have yet to directly deny it being an indication of a future Half-Life game, despite being asked numerous times about it.
However, the shirt is not only an actual shirt, but it was worn by a valve employee and spotted by a developer of Monday Night Combat, who proceeded to post it on his twitter. This was posted last Friday, and Valve have yet to directly deny it being an indication of a future Half-Life game, despite being asked numerous times about it.