Collateral achievement bug?

[nyan_nyan_19]

Hello there. Completed the game and got all the achievements but Collateral. Does anyone know something about it's hidden requirements?

Just farmed ~280 flies with spike moving platform in one go in chapter 3. It didn't pop
Previously farmed ~300 razorbladearmers in chapter 7 I believe (the place after a fountain with round saws, which kill 8 enemies and then you die -> respawn -> repeat). It also didn't pop

But since this achievement is 6th in the list of popularity I assume most players got it naturally just by playing through the game, so I don't have any clue what should I do (even reinstalling the game didn't help)

[nyan_nyan_19]

upd:
uninstalled the game -> turned off sync with steam cloud -> deleted all files from C:\Users\admin\AppData\Roaming\Wayforward Technologies\BloodRayne -> installed the game -> completed the first two chapters -> in chapter 3 farmed ~300 flies with spikes -> still no pop :c

planning on moving on to chapter 7

[nyan_nyan_19]

upd:
saw vs razorblades in chapter 7 finally worked for me

although I can't say whether or not you have to damage them first by yourself since I lost count of how many enemies died for my achievement