Overview
This is a 100% guaranteed to work, if you are not able to obtain the achievement after doing this, please roast me in the comments. (except for people who played under 100 hours bc they are noob and connot roast anyone over 800 hours)To get the OCD achievement you have to go to the advanced training menu and you’ll notice that the bottom right corner is different from the other corners, it should be white, so you then need to click on the white corner to obtain the achievement.For those who cannot find the white corner or do not have adv training yet, this was done at around boss 110 with a little more than 400 million energy with the theme set at normal. (hopefully that isnt required and can be done by anyone)If i missed something or the OCD achievement got changed, please tell me and ill try to update this guide.
The Process
just click the white corner in the adv training menu its not that hard.