Maybe if you use a different frame of reference to explain it to him, he may be able to understand your point and your frustration ?
Try asking him
''Imagine you're at a new job.
Week 1 - Your main duties are a, b and c. Files for a are in cabinet 1, for b in cabinet 2 and for c in cabinet 3. You must have these completed every day.
Week 2 - Now you know a, b and c, you need to have jobs x, y and z done by Thu every week.
Week 3 - We've had a complaint that you've left dirty dishes in the kitchen. Here, everyone must clean up after themselves in the staff kitchen.
Week 4 - So you now have a good understanding of a, b and c, and have coped well doing x, y and z by Thurs, and thank you for taking on board the advice about keeping the staff kitchen tidy.
Week 5 - We've had complaints that you're forgetting to do a and b this week, and you also missed Thur's deadline for y and z........
Now, would your husband see himself as a 'good' employee in that scenario ? No, he wouldn't.
That is because he understands that it's his responsibility, once he's been made aware of what needs done and when, to remember and complete his 'work' duties. It's not his boss's responsibility to tell him repeatedly that he needs to do things, is it ? No ! He is quite rightly expected to think for himself !!
And it's not YOUR responsibility to repeatedly ask/tell him what needs done and when either !!!! You're not his 'supervisor' or his Mother ! 
Now ask him if he thinks he's a 'good' husband..............who takes on his fair share of the 'mental load' ??
Ask him if he'd be 'attracted' to a partner who acted like a helpless child who seemingly couldn't even think for themselves ? Who would always wait for 'instructions' and never took any initiative at home ?? 
You've already talked about what needs done and when. He's had the information required to get on and do the job. (He just doesn't think it's his bloody job, does he ?) He lives there too. He eats, he uses plates and cutlery, he wears clothes, he sleeps in the bed, he can see the 'mess' the same as you do !
He can either step up think for himself and take responsibility for doing his 50%, or he can find some other mug to play at being his Mummy, can't he ?? 