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Hi all, I'm 99% sure I've unlocked all the weapons but the Master of Arms achievement is still locked. Not sure if im missing something. The weapons I have unlocked are:

1. Perforator
2. Harvester
3. Gustav
4. Plasmatech 3000
5. Shredder
6. AC 50
7. Boomstick
8. Torment's Edge

I have used all of them at least once but i haven't completed the game with all of them yet
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The Quick Learner achievement is also not popping for me for some reason (unlock all upgrades)