Here is the full list of all 35 The Infectious Madness of Doctor Dekker achievements.
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!
One thousand questions asked!
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
One hundred and fifty insanity points reached
Two hundred insanity points reached
Three hundred insanity points reached
Five hundred insanity points reached
You made Nathan sing a song.
Zero hints, and you absolutely didn't cheat at all.
Excellent hint usage.
It's a bit hinty in here.