Quick simple suggestion here (pretty sure the pros and cons explains themselves, really just depends on how firm the "hidden til you get it" policy is!)....

I am suggesting that for the price of 10 credits you are able to view the %'s that your Hardcore Achievements are currently on. (Only for the Achievements that you've already completed the 'Final' Phase for, otherwise it'd just be 0, obviously.)

As for the amount of time that you'd be able to view these %'s, I was thinking somewhere along the timeline of however long it is you can see your City Specific ones after you've paid the Credit. Perhaps a little longer, given that it's 10x as costly - but regardless, worth the 10 to see something you couldn't before surely!

Thoughts? Any real negatives to this?

As it's been pointed out to me, the price of 10 credits might a bit steep considering that the Reward(s) you'd be getting from whatever HARDCORE Achievement you're working on, likely isn't going to net you 10 credits back anyway.

So, that opens up a new question for this...what WOULD be a reasonable price? I'm halving my previous suggestion, and hereby going with 5 credits to reveal your Hardcore Achievements for a brief time!

I think you misunderstood me, Senka. I meant how long that particular thing would show if you were doing it with 1 Credit, 1 time show deal. Not if you have the Achievement Reveal lol.

I like this idea, I am at the point where most of my achievements are completed except for the hardcores. 

Was just thinking it would be nice to be able to have a hardcore achievement reveal perk or the ability to purchase a 15 or 30 day reveal for a price.