|Make 100 Purchases.|
During your journey through the metro, you'll visit merchants that will buy/sell you items. There aren't very many in the game, so if you come across one, take the time to check out his wares. Throwing knives and grenades are both items that can be purchased/sold for the same price. Sell any and buy back all knives and continue to do so until you unlock the achievement.
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User Score is based on 150 user ratings.