I don't understand, I have 26 hours of play time but I didn't get the 24h achievement.

Actually, it tracks how much you studied through the microphone on your phone, it knows how many chapters you've actually gone through. It also estimates exactly what grade you'll get on your exam in real time, so you can stop at exactly the minimum passing grade. Great tool!

yeah just change the time on the computer 100 hours from that point and then you've done everything

nah man you can just change the time on your computer and it will count

that just supid , you just need to study

nah immma study hard to get them :)

I just want to clear/reset my achievements :(

So for the people struggling to get the 50h and the 100h achievements, you simply have to set a study time for 100h to get both of the achievements to pop, just having the game open and running without a study time active, doesn't count. That's how my 10h achievement had to be done.

Same here, 107 h on record and the last 100 h achievement isn't obtained

Clocked 55 hours already but still no 50h badge :(( Whyyy