Here is the full list of all 31 Cabin Fever achievements.
Get all 8 endings
Jump
Seek treatment, just like you promised
Get the phone number wrong
Live happily ever after
Remember the phone number (pretty impressive!)
Show up a little too late
Get into a car accident
Fall into a forest ravine
Discover the heart Mallory stitched into your ripped jeans
Ask Mallory about her favorite memory
Complete Chapter 8: Infection
Accept the offered treatment
Hitch a ride into the city
Get caught in your own bear trap
Read the spam every time
Complete Chapter 7: Integration
Complete Chapter 6: Attachment
Savor the most amazing breakfast ever with Mallory
Complete Chapter 5: Maturation
Pull up over 420 weeds
Read the spam once
Complete Chapter 4: Growth
Introduce Mallory to the baby chicks
Have a nice breakfast with Mallory!
Complete Chapter 3: Germination
Suffer through "breakfast" with Mallory
Complete Chapter 2: Seed
Stay inside and lock the doors
Complete Chapter 1: Prologue