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Renegade Ops / Nuclear Dawn / King Arthur - The Role-playing Wargame / HAWX / Killing Floor / S.T.A.L.K.E.R.: Call of Pripyat ?
FlatOut, Serious Sam HD: The Second Encounter or Hunted: The Demon’s Forge?
Hoard and Day of Defeat: Source for L4D2
Both games will get an achievement according to this site: http://steamcheeves.com/