What are the "Željezo se kuje dok je vruce. Cega nema, ne mose se ni uzeti" in the Payday 2 achievements for?
These achievements just popped up in Payday 2. NO clue what language they're in, nor why they don't obviously look English like.
What are these achievements for?
It's Croatian.
"Cega nema, ne mose se ni uzeti" is a Croatian proverb. It means, "Nothing ventured, nothing gained."
"Željezo se kuje dok je vruće" means, "Forge (or Strike) while the iron is hot."
As for the reason behind the achievements, the only ones who know that at the moment are the developers themselves. I've asked them about it, and will update should I get a response.
These were revealed as the achievements for the new "The Bomb" heist released by Overkill for Payday 2: