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