All of the game specific trainers work for me perfectly fine. And the Achievement Enabler works for me for H1, H2, H3, H3ODST and H4. I just can't get it to work for Halo Reach.
I follow the same process for using the trainers for those that worked as I do for Halo Reach.
Hope that clears up what I was saying. Was just posting to see if someone could confirm that at this moment, it's working for them in Reach. If it is, then I'll assume it's something with my game/computer/etc.
[Edited by Ezio, 2/10/2022 11:10:49 PM]
After a bit more testing, I don't think this is the fault of the trainer. It seems that some Halo Reach achievements have bugged for quite a few people.