Flies.

1. 
   EatenSecret

   Steam withholds the description of a secret achievement.
   100%
2. 
   Slight oversightSecret

   Steam withholds the description of a secret achievement.
   50%
3. 
   SwattedSecret

   Steam withholds the description of a secret achievement.
   50%
4. 
   Burnt outSecret

   Steam withholds the description of a secret achievement.
   25%
5. 
   Just five more minutesSecret

   Steam withholds the description of a secret achievement.
   25%
6. 
   Nice cup of teaSecret

   Steam withholds the description of a secret achievement.
   25%
7. 
   Did you bake a cake for me?Secret

   Steam withholds the description of a secret achievement.
   25%
8. 
   Flies.Secret

   Steam withholds the description of a secret achievement.
   25%
9. 
   Time fliesSecret

   Steam withholds the description of a secret achievement.
   25%
10. 
    One of many

    Kill one or more fly.
    50%
11. 
    Making walks!

    Kill 500 or more flies.
    25%
12. 
    Pest control

    Kill 2000 or more flies.
    25%
13. 
    Not much of a problem anymore.

    Kill 95% of the flies on the map.
    25%
14. 
    Smoke and mirrors

    See all of the hints.
    25%
15. 
    Burning-ham

    Ruin a perfectly good cake.
    25%
16. 
    Toilet humour

    Interact with the toilet. What did you expect to happen?
    25%
17. 
    Wrong order

    Connect the cables in the wrong order.
    50%
18. 
    DIY

    Craft a fly swatter.
    50%
19. 
    No Loose Ends

    Get all endings.
    25%
20. 
    Sweet box

    Open the box of sugar.
    25%
21. 
    What was that?

    Something in the forest?
    25%
22. 
    Where was that?

    Something smells your cake?
    25%
23. 
    Lights off

    Turn on the generator first.
    25%
24. 
    In the dark

    Let the generator run dry.
    75%
25. 
    Filled with protein!Secret

    Steam withholds the description of a secret achievement.
    25%
26. 
    Tennis for oneSecret

    Steam withholds the description of a secret achievement.
    25%
27. 
    Sort of ShapesSecret

    Steam withholds the description of a secret achievement.
    25%
28. 
    DodgersSecret

    Steam withholds the description of a secret achievement.
    25%
29. 
    Every teenagers dream.

    Craft an improvised flamethrower.
    25%
30. 
    100%

    Complete "Flies."
    0.0%
31. 
    Hoarder

    Pick up every item at least once.
    0.0%

Names, descriptions and icons are the game’s own, as Steam publishes them; the share is how many owners have unlocked each, from Steam's global figures for 31 of them.