In-game achievements

[oof2win2]

Tiers of achievements, i.e. a player would get "awarded" on Discord. There would be achievements for:

• oof2win2 killed x biters
• oof2win2 built x entities
• oof2win2 lasted x hours without dying

Killing and building are able to be already built, however lasted x hours without dying isn't available yet, as the latest time of death would need to be recorded when modyfing deaths.
I attempted this with d2281a8 unsuccesfully, might be a starting point (or not)

[github-actions]

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