The Lord of the Rings: Gollum
Microtransactions in The Lord of the Rings: Gollum are summarized as...
The game is full priced with an optional deluxe edition that sells for an additional 10$. This deluxe edition features lore-based content. Such as an in-game lore compendium, and lore accurate voice acting. It also features some cosmetic content in the form of emotes.
These are somewhat strange features to be pay walled, it's not often in-game lore requires extra pay.
Each of the items in the Deluxe edition can also be purchased separately. For example if all you care about are the extra emotes, you can buy just those for 3$.
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Content that is usually expected with the initial purchase is instead locked behind other purchases. 👍
There are no additional purchases other than a "deluxe" version of the game. No microtransactions, no DLC.