The "Delivery Service" achievement requires you to deliver 10K items to your player. This is quite a lot of items - and generally you don't have stuff delivered to yourself, you have it delivered to requester chests.
I've discovered that with this setup:
You can throw away items that you're requesting - for example, this:
And the bots remove the items from my person to the closest logistics chest, and then return them to me immediately, increasing my delivery count. Note how my tracked achievement has increased by .1K (100 items).
Again, I can't see how this can be prevented. Perhaps a boolean flag on each item like __HasBeenThrownAway so if the item is returned to the player, it doesn't count towards the achievement?