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The Orange Box: Half-Life 2: Episode Two Hints
Acid Reflux (EP2_KILL_POISONANTLION)
1 of 2: All you have to do for this achievement is kill one of the new antlion worker creatures.
2 of 2: The perfect opportunity to do this is when you drop down into a certain tunnel in Chapter 1's Section 2: Antlion Caverns. See its hints for the details.
