Here I found very little information. Most achievements are self-explaining, while some out layers are cause for massive confusion. For example, according to the HWBOT statistics, I submitted about 100 results with a Gigabyte motherboard and there is an achievement for making lots of posts with Gigabyte boards.

Now my confusion, did I lose the ability to count or did the server count different?

If the achievements made sense, I should have gotten the "make 100 submission with a Gigabyte board", which I have already done. However, the achievement still marks me as "in progress".

Do I have to make 100 submissions for that or more? It doesn't say, nor does it say, when or how it would award the achievement. It's not important, it just doesn't make sense, that the 100 submission award didn't come by submission 156.

Is there something else I still need to do?

There is no Gigabyte mainboard for at least 100 subs