Counter-Strike: Condition Zero

Medium (8h-15h)
no achievements

Counter-Strike: Condition Zero Deleted Scenes

Medium (8h-15h)
no achievements

Counter-Strike: Source

Very Long (>25h)
0 of 147 achievements (0%)

Half-Life 2: Deathmatch

Long (15h-25h)
no achievements

Half-Life: Source

Short (2h-8h)
no achievements