Special TSA Calculation method for games like this?

I'd say it seems a tad unfair that such an exceedingly difficult game/achievement should get such a low ratio due to it being the sole achievement for the game. Must be disappointing to those who spent hours and hours to earn it.

I'm not exactly sure what the best approach would be, but perhaps either have this game use the old TSA calculation method, which I don't think would be possible as it would mess up the system now, by having a 0 achievement game showing up for people.

An alternative solution would be to give it a static TSA score/Ratio. Something like this would have to be decided upon by the game info staff probably to judge difficulty and possibly could take suggestions for a point total from users here.

So, I'm suggesting this achievement be given a constant 10.0 ratio, giving it a whopping 100TSA. I've heard that this achievement is exceptionally difficult, and so I'd compare it to something like the Master Runner achievement in Bit.Trip Runner, which was really difficult as well and has approximately a 100TSA score that has stayed around there for a while.

Edit: Looking at my best achievements, I'd say 100TSA sounds even more perfect (I was wrong; master runner is 169 TSA at this moment). It's not too high for something like this, and not too low either. Perhaps the GI team could ask those who have earned it to weigh in?

There was a big discussion about that a few weeks ago, this point has already been discussed. It's a "collateral damage" of this new calculation method. I especially mentionned this point on that thread.
But community decided to accept that and now, all 1 achievement-game worths 10 points, even if super hard to unlock! And I guess community and devs won't go back on track again for now...

(Edit) Previous thread, before the modification occured:
Use TA's method of "completion percentage" calculations