The sequence with which you gain achievement, in Combat Evolved, for completing the single player campaign missions is wrong.
If you complete, for example, the 4th mission (Silent Cartographer) you get the achievement for completing the second mission (Halo) and so on. I understand that its not a big deal but its confusing, it would be better if you could take a look at it.
Cheers, have a nice day
Oh, I didn’t know that. Thank you very much, I’ll do it now!