Here is the full list of all 24 JEF achievements.
Run simulation on Skolgajar for an hour.
Find the sleeping scientist on Skolgajar.
Chat with 10 strangers in Skolgajar
Earn 200 credits on easy mode in the credit machine
Earn 200 credits on normal mode in the credit machine.
Earn 200 credits on hard mode in the credit machine.
100 teeth collected at DogHead's race track
Finished DogHead's race in under 100 seconds.
Found achievement switch in DogHead's forest stadium.
Found mystery drawing one at HOTR Home Furnishing.
Chat with 5 builders at HOTR Home Furnishing.
Pass through 15 holes in a row in Universe Transport System.
Find 20 orbs in the astral plane
Find Mystery Drawing Two in the astral plane
Fly without landing for 5 minutes in the astral plane.
Read all the magazines in the waiting room
Outran all your demons with full mental health.
Received name from Dr. Grinberg.
Jumped off a giant platform to start the game.
Walked out onto the air in Karzalinx.
Finish the secret maze game on Karzalinx.
Chat with at least one forest sprite in Skolgajar
Collect and read the entire story of Steve and Janet
Find all 3 Cult Videos in Karzalinx