Here is the full list of all 35 The Infectious Madness of Doctor Dekker achievements.
Solved in one
Sixteen hours played
Solved in two
Five hundred insanity points reached
Two thousand questions asked!
You made Nathan sing a song.
One thousand responses revealed!
Three hundred insanity points reached
Two hundred insanity points reached
Seven hundred and fifty responses revealed!
One hundred and fifty insanity points reached
One hundred insanity points reached
Eight hours played
One thousand questions asked!
Five hundred responses revealed!
Four hours played
Five hundred questions asked!
Two hundred and fifty responses revealed!
Two hours played
Fifty insanity points reached
Two hundred and fifty questions asked!
One hundred responses revealed!
One hundred questions asked!
Ten responses revealed!
Twenty questions - well done!
Three thousand questions asked!
Twenty hours played
Twenty five hours played
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.