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