Full list of all 52 Investigator achievements.
The base game contains 34 achievements, and there is 1 DLC pack containing 18 achievements.
Complete the tenth level
Play the guitar
Burn on a hot plate
Find the gnome on 10 level
Find the saw room
Complete the ninth level
Complete the eighth level
Complete the seventh level
Collect five gnomes in the seventh location
Make a snowman
Fall through the Ice
Complete the sixth level
4 8 15 16 23 42
You are bitten by a spider at the sixth location
Complete the fifth level
Complete the fourth level
Get in the face
Do not kill spider
Try to get away from Johnny
Complete the third level
Explore the plane
Find the gnome at the third location
Complete the second level
Kill the spider
Dial pockets full of garbage
Complete the first level
Find the gnome in the toilet
Warmed by the fire
Push the barrel into the water
Play the game
Kill Steve
Do not kill Steve
Kick the ball into the goal
Find six gnomes in DLC
Play "Survivor Update"
Find five balls in "Survivor Update"
Find Artifact in "Survivor Update"
Find second Artifact in "Survivor Update"
You were eaten! "Survivor Update"
The way "Survivor Update"
Too slow! "Survivor Update"
Find a suitcase with achievements "Survivor Update"
Find a can of fuel "Survivor Update"
Look where you're going! This is not Assassin Creed "Survivor Update"
Find the hidden achievement on the fifth level "Survivor Update"
Finish "Survivor Update"
Find new shoes