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