Helldivers 2
Microtransactions in Helldivers 2 are summarized as...
The game contains a store with both cosmetic and gameplay altering items, with a focus largely towards cosmetic items. This store used to contain only a select few items, and rotate through different sets on a timed basis. This is no longer the case, the shop now features all items simultaneously. These items are purchased using a premium currency, however this currency can be earned through regular gameplay as well.
The premium currency comes in bundles that always leave you with a little bit left over. That being said, all cosmetics are relatively cheap compared to other games. Most cosmetics used to range between 1-3 USD, but prices have steadily increased over time. Since the premium currency can also be earned in-game most cosmetics can be earned for free.
Recently the game introduced their first "collab". This collab features unique cosmetics, weapons, and armor. These items are vastly more expensive than other items in the store. They can still be earned through regular play, just like other store items, but doing so will require a much larger time investment, one that might not be realistic within the time frame given to purchase these items, as they are only available for a limited period.
The game contains multiple Battle Passes with a free and a premium track. The premium track can be purchased using the premium currency, which means you can earn it through regular play as well and no purchase is necessary. The battle pass does not expire with time. New battle passes release frequently. At first this was once a month, but this has since slowed down due to quality concerns.
Some items in the Battle Pass are not cosmetic only, they provide different weapons or certain gameplay enhancing items for your team.
Purchasing all items in the store solely with currency earned for free is possible, but not a realistic goal for most players. The shop offers a large amount of items and adds more on a regular basis. With the various Battle Passes also available for the same currency, it would be require a large time investment to earn enough currency for everything.

