Secret charm mechanic

It would be interesting if could be implemented to the game a secret charm mechanic.

Just like Steam Achievements, but the charms would be a secret and players would manage to discover and gain it.

For example, a survivor being chased for x amount of time without vaulting a window will unlock X charm.

Killing 4 survivors using XXXX perks will unlock an specif charm.

I think it will give players a new and exciting objective.

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