Hello there!
After having listened to your feedback, we are reworking a couple things regarding the Achievements:
First of all, and most important, the (old) Master Coin Collector Achievement now only requires you to gather 500 total Coins, a more fair and achievable achievement (pun intended) ːsteamhappyːːsteamhappyː
Second, we have also included 4 completely new Achievements, requiring you to collect unique Coins, that is, repeated units won't count for this one! ːsteamthisː
This new Achievements are more humble in scope and easier to get, and you should be able to easily get all of them way before having collected 500 Coins ːsteamhappyː
We have rebranded some of the old Achievements and updated their titles and images, but, most important, now clicking the Coin at least once rewards you with the "I clicked the Coin - Coin", along with the classic Achievement as well ːsteamhappyː
We have listened to your feedback, which we really appreciate, we are sorry if we didn't mange to reach all questions out there, we are working real hard and we really hope it shows! ːsteamthumbsupː
Have a good one!