Achievements not unlocking

[Colonel Ruff-Diamond]

Hello. I've really enjoyed playing Hotline Miami and have now completed the story. I decided to go back and try and hunt some achievements but noticed that none of them had unlocked. Even achievements I know I have performed in game (such as x4 and x8 combos) do not unlock on Steam. Literally nothing has unlocked in 6 hours of playtime.

I've tried uninstalling and reinstalling the game but without any luck.

Can anyone offer any advice on how to get the achievements working?

[SpadeRZA]

Same here with "These are my guns" and unlocking all weapons. Is buggy I suppose.

[Super Brian]

I had a problem getting the ground kill achievement and wear all masks while using the xbox 360 gamepad, once I went back to the mouse and keyboard I got the achievements.

[DRTYSANTACLAUSE]

I'm having the same problem. Ugh it's so frustrating.