Here is the full list of all 35 The Infectious Madness of Doctor Dekker achievements.
Solved in one
Five hundred insanity points reached
You made Nathan sing a song.
One thousand responses revealed!
Three hundred insanity points reached
Eight hours played
Two hundred insanity points reached
One thousand questions asked!
One hundred and fifty insanity points reached
Seven hundred and fifty responses revealed!
One hundred insanity points reached
Five hundred responses revealed!
Four hours played
Five hundred questions asked!
Two hundred and fifty responses revealed!
Fifty insanity points reached
Two hours played
Two hundred and fifty questions asked!
One hundred responses revealed!
One hundred questions asked!
Twenty questions - well done!
Ten responses revealed!
Two thousand questions asked!
Three thousand questions asked!
Sixteen hours played
Twenty hours played
Twenty five hours played
Solved in two
Solved in three
Solved in four
Solved in five
Solved in six
Zero hints, and you absolutely didn't cheat at all.
Excellent hint usage.
It's a bit hinty in here.