"Ghost of Christmas Present" achievement. Reddit +5 The "Ghost of Christmas Present" Achievement This achievement requires a player to "spread cheer by helping a free holiday player survive a campaign". Steam Community +1 11 sites Ghost of Christmas Present achievement - Steam Community Jul 11, 2014 —
In December 2013, Valve celebrated the holidays by giving away Left 4 Dead 2 left 4 dead 2 christmas 2013 dlc
To earn it, you must help a "free holiday player" (someone with the Christmas 2013 DLC) survive a full campaign from start to finish. "Ghost of Christmas Present" achievement