Does unlocking achievements still work?

I’m wondering if the ability to unlock achievements with Horizon still works. I’ve tried using Profile Editor and Le Fluffle and neither have worked for me. I’ve unlocked a singular achievement both online and offline with no results. The achievement in question is still active, I’m just not a good enough player (or I don’t want to spend the hours required) to get it. There’s two total achievements I’m after.

Any chance someone is able to test who has Diamond?