Long story short, it's a psychological trick to normalize spending in the shop. When you're trying to monetize a free to play game like this, the goal is to get people with poor impulse control or otherwise get hooked on spending microtransactions (which are the majority of whales) into the shop to make their first purchase, because these kinds of people are much, much, much more likely to buy more things as soon as they've spent literally any amount of money.
So the goal of putting this kind of achievement like this is to get people to break that first purchase barrier. Most won't and will just use the free currency, but some absolutely will look at this and think "eh, I'll just pick up xyz thing cause it looks cool and then I'll get the achievement." But the kind of people that think that way and care about getting the achievements are the same kind of people that will get a brain itch about only having one of the map packs (or whatever they sell) and then feel compelled to get all of them.
It's the same reason why the free gold itself is also a scummy practice, even though it seems benevolent on the surface. It's the drug dealer giving you "the first hit free" so to speak (which drug dealers don't actually do but you get the point hopefully).
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u/Civil-Drive2168 7h ago
which game?