Hardest of Core Badge DOESN'T have to be on hardcore gamemode, as it is not in the badge's description. All you have to do is report missing achievement and send a screenshot as proof.
The least unhappy ending imo:
Work in the lab every day except for the last. You can then take your daughter to the park and you'll die together.
I think it's an amazing game, but it makes me sad :,(
 "Doom 1"){kind=icon}
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