If you're an achievement hunter or just want to get these two, then you need to go by these pretty simple step.

Dirty Larry, the name of this one is confusing but once you know it very easy and you might even get it without searching for it. So basicly you just need to kill 44 zombies with a 44. Revolver, That's it

Specification,

-the kills do not need to be consecutive
-you can use any 44. ammo or quality 44. revolver

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Polar Bear Club, the name guide you to it but what it need to be unlocked is to go in a water source
without clothes on in the Snow Biome. That's it

Hint, as today (August 21st, 2025) the easiest source to find is in front of the snow dealer on the
other side of the road


Hope it as helped you