Supply and Provisioning Achievements.

[Rognis]

I raised this on another board, and the consensus was you had to do the advanced supply missions. So basically use your GC credits to buy items and then hand them back into the Quartermaster, you'll lose out on your GC credit return but it does could as one mission (someone even tested it as a result of my post and confirmed).

I attempted this, with Private rank items, Second lieutenant Items and made an HQ Militia Scythe to try with that, Doing the Expert supply missions did nothing to progress my Provisioning or Supply numbers for the achievements.