Locked Achievements

Well over time, I’ve gained about 14 achievements. I should have about 3 more, but Steam says all the achievements are locked, as in, It won’t grant them to me, kind of like how steam locks achievements with sv_cheats 1 on in half life 2.
All I’ve been doing is playing rp servers, and it’s been several months, but my achievements are still locked. I know it’s not really a big deal, but how would I go about unlocking them?
One achievement I should have is “One Month”, and I’ve exceeded the required hours for it, but it still hasn’t been granted.

Is it the same server?

[editline]12:22AM[/editline]

I mean, have you only been playing on one server?

[editline]12:22AM[/editline]

Because sv_cheats 1 disables them in gmod, too

Multiple servers, none of them have sv_cheats on however